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Revelers around the world usher in 2017 with celebrations, tributes
As 2016 draws to a close, revelers around the world are bidding a weary adieu to a year filled with political surprises, prolonged conflicts, deadly attacks at gatherings and deaths of legendary celebrities.
Here's a look at how people are ushering in the new year:
Sydney sent up a dazzling tribute to 2016's fallen icons with a New Year's Eve fireworks display honoring the late singer David Bowie and late actor Gene Wilder, becoming the first major city to bid a bittersweet adieu to a turbulent year.
The glittering display over Sydney's harbor and bridge featured Saturn- and star-shaped fireworks set to "Space Oddity," the classic song by Bowie, among the seemingly endless parade of beloved entertainers who died in 2016.
Wilder was honored as the bridge lit up in a rainbow of colors while a song from his film "Willy Wonka and the Chocolate Factory" played.
New Year's celebrations turned deadly when an armed assailant believed to have been dressed as Santa Claus opened fire at a nightclub in Istanbul, killing dozens of people.
Istanbul's governor says at least 35 people were killed and 40 others were wounded.
Security measures had been heightened in major Turkish cities, with police barring traffic leading up to key squares in Istanbul and the capital, Ankara. In Istanbul, 17,000 police officers were on duty, some camouflaged as Santa Claus or street vendors.
Ankara and Istanbul have been targeted by several attacks in 2016 carried out by the Islamic State group or Kurdish rebels, killing more than 180 people.
Neslihan Dogruol, a restaurant owner in a chic Istanbul neighborhood, said she hopes for peace in 2017 following a year filled with "unrest and death."
"2016 affected everyone badly," she said.
More than 2 million people have welcomed 2017 at Rio de Janeiro's Copacabana beach.
Twelve minutes of fireworks amazed many of the more than 860,000 tourists who traveled to Rio for the party.
The event was more modest than last year due to the city's recession. Still, tourists and Brazilians enjoyed a festival of sounds, including two sets of drums from popular samba schools.
A decked-out bride and groom walking to a chapel and photo-happy tourists from halfway around the world were among the estimated 300,000 visitors turning out to celebrate the new year Las Vegas style.
The city's celebration features some of the biggest names in music headlining nightclubs and a fireworks show launching from the tops of half a dozen high-rise casinos.
Local police joined forces with the National Guard, the Secret Service and FBI agents to protect Sin City on one of its biggest nights of the year.
In Berlin the mood was more somber than celebratory.
"I don't like the way politics is going," Daniel Brandt said. "Fears are being fanned, and people are so angry with each other."
The tone of public debate in Germany has become shriller over the past two years with the influx of hundreds of thousands of migrants.
Walking by the Reichstag, Germany's Parliament building, Hamed Noori said 2016 had been a good year.
"I came to Germany from Afghanistan," he said. "Life is better here."
Nicole Durand-Nusser, originally from France but living in Berlin for almost 50 years, said 2016 had been a difficult year: "Brexit, Trump, Erdogan — it's all getting worse."
Later, police said they arrested a man who shouted "bomb, bomb, bomb" at Berlin's massive open-air New Year's party.
President Vladimir Putin invoked a bit of seasonal enchantment in his New Year's Eve remarks to the nation.
"Each of us may become something of a magician on the night of the New Year," Putin said in a short televised address broadcast in the closing minutes of 2016 in each of Russia's 11 time zones. "To do this we simply need to treat our parents with love and gratitude, take care of our children and families, respect our colleagues at work, nurture our friendships, defend truth and justice, be merciful and help those who are in need of support. This is the whole secret."
New Year's Eve is Russia's major gift-giving holiday, and big Russian cities were awash in festive lights and decorations. The Moscow subway offered a special holiday train, festooned with lights and artificial greenery.
Tourists and French revelers swarmed along Paris' illuminated Champs Elysees Avenue on a frosty night, admiring the laser display from the Arc de Triomphe and lines of trees sparkling with lights.
"It's so magical to be here in Paris, on what people say is the world's most beautiful avenue," said Maureen O'Reilly, a visitor from Belfast, Northern Ireland. "At times like this, I do think about all those terrible things in Aleppo and how lucky we are here in Europe despite everything."
Some people were happy to say goodbye to 2016.
"It's been such a horrible year, with all these (entertainment celebrity) deaths, Syria, Brexit and Trump. I say: good riddance," said Karine Dublot, from Lyon.
Pope Francis has called on the faithful to help young people find a place in society, noting the paradox of "a culture that idolizes youth" but has made no place for the young.
Francis said during vespers marking New Year's Eve that young people have been "pushed to the margins of public life, forcing them to migrate or to beg for jobs that no longer exist, or fail to promise them a future."
Temple bells echoed at midnight as families gather around noodles and revelers flock to shrines for the biggest holiday in Japan.
Kami Miyamoto, an economics student at Meiji University in Tokyo, traveled home in Hakusan, Ishikawa prefecture, for the holiday.
"The world is heading toward conservative insular policies," she said of the U.S. election, Brexit and what she believes lies ahead for elections in Europe in 2017. "We learned about how valuable it is to get correct information."
Miyamoto's mother was preparing soba noodles, a standard New Year's Eve dish in Japan, except in their home it will be filled with green onions and shrimp. As the new year rolls in, the entire family, including her younger brother and sister, will drive to a nearby shrine, which, like temples all over Japan, will be filled with those praying for good fortune in the Year of the Rooster, according to the Chinese zodiac.
Residents in Beijing and Shanghai, China's two largest cities, were passing New Year's Eve quietly in a relative state of security lockdown, according to Chinese media reports citing police.
The Bund waterfront in Shanghai had no celebrations, authorities announced this week, while the sale, use and transportation of fireworks in central Shanghai will be prohibited.
Large buildings that often display light shows also stayed dark. More than 30 people died two years ago in a deadly stampede on Shanghai's waterfront, where 300,000 people had gathered to watch a planned light show.
Chinese President Xi Jinping said in his New Year's Eve address his government will continue to focus on alleviating poverty at home and resolutely defending China's territorial rights.
Hundreds of thousands of South Koreans ushered in the new year with a massive protest demanding the resignation of disgraced President Park Geun-hye. It was the 10th straight weekend of protests that led to Park's impeachment on Dec. 9 over a corruption scandal.
The evening rally was planned to overlap with Seoul's traditional bell-tolling ceremony at the Bosinkgak pavilion at midnight, which was also expected to be a political statement against Park.
The city's mayor, Park Won-soon, invited as guests a man whose teenage son was among more than 300 people who died during a 2014 ferry sinking and a woman who was forced into sexual slavery by Japan's World War II military.
Park Geun-hye came under heavy criticism over the way her government handled the ferry disaster.
For most people in India, New Year's Eve is a time for family. In New Delhi and many other cities, newspapers are full of big advertisements for lavish parties at upscale hotels and restaurants. The big draws at the hotel parties are song and dance performances from Bollywood and television stars.
The western city of Mumbai was to host big street parties with thousands of people at the iconic Gateway of India, a colonial-era structure on the waterfront overlooking the Arabian Sea. And there was talk about money — India's recent devaluing of its currency in an apparent effort to cut graft and tax evasion.
The Philippines' notorious tradition of dangerous New Year's Eve celebrations persisted after President Rodrigo Duterte delayed to next year his ban on the use of powerful firecrackers, often worsened by celebratory gunfire.
Powerful firecrackers and gunfire have maimed hundreds of people and killed some each year across the Philippines despite government crackdowns, an annual government scare campaign and efforts by officials to set up centralized fireworks displays, like on Saturday night.
Duterte's southern Davao City hasn't been tainted by the bloody record because of a largely successful firecrackers ban he enforced when he was still the city's crime-busting mayor. Last month, he said he would delay his plan to replicate his Davao ban nationwide by a year because many have already invested in firecrackers and he was concerned by the impact of an abrupt ban on poor Filipinos employed in the industry.
Before New Year's Eve, the Department of Health said Saturday that 139 people had been injured by firecracker blasts in recent days.
New Year's is the biggest party of the year in Romania, and thousands of people flocked to the mountains to ski, hike and celebrate, some in the mood for fun, others anxious about global challenges in 2017.
Former Finance Minister Daniel Daianu, traveling to the mountain town of Sinaia, said Western governments should pay closer attention to the public mood.
"People are frustrated, people are resentful and people react," he said. "Unless governments pay attention to fairness and fair play, we could see some very unpleasant surprises."
Early Saturday, young Romanians roamed streets and trains, wearing peasant costumes and singing traditional songs about goats, a New Year symbol, while waving wands made of dried flowers.
UNITED ARAB EMIRATES
In Dubai, hundreds of thousands of people watched fireworks shoot from the sides of the world's tallest building, the Burj Khalifa.
There was no repeat of the chaos of last year, when police say faulty wiring sparked a fire several hours before midnight at a skyscraper nearby.
NEW YORK CITY
New Year's Eve revelers began to fill Times Square hours before the glittering crystal ball was to drop.
Officials estimated as many as a million celebrants would descend upon the Crossroads of the World, braving cold temperatures and strong winds to bring in the New Year amid heavy police protection.
Stefania Moran, from Puebla, Mexico, and five friends traveled to New York to secure a coveted spot in one of 35 metal pens where re-entry is prohibited.
"I've always wanted to come to New York, and this is one of the must-dos before you die," she said.
Dozens of 20-ton sanitation trucks weighted with an extra 15 tons of sand blocked off streets leading to the celebration zone. About 7,000 police officers, along with specially armed counterterrorism units and bomb-sniffing dogs, were on guard.
This year, United Nations Secretary-General Ban Ki-moon has the honor of pushing the Waterford crystal button that begins a 60-second countdown to 2017.
Mariah Carey is the headline performer in Times Square for "Dick Clark's New Year's Rockin' Eve with Ryan Seacrest" on ABC.
Finland has kicked off celebrations for 100 years of independence from Russia.
Tens of thousands of people gathered in Helsinki for a concert and a huge fireworks display to celebrate the beginning of festivities marking its independence.
Throughout 2017 there will be hundreds of events in the Nordic nation of 5.5 million, from films, dance parties and environment-related events to concerts and activities linked to its renowned sauna tradition.
Celebrations will culminate on Dec. 6, the day Finnish Parliament declared independence in 1917 amid the turmoil of the Russian Revolution.
Finland shares an 800-mile border with Russia. Russian President Vladimir Putin on Friday congratulated Finland for its centenary in a phone conversation with Finnish President Sauli Niinisto.
Thousands of people in Mexico City are expected to turn out for a New Year's Eve concert at the Monument to Independence, better known as The Angel.
Workers spent several days setting up a stage and a booming sound system along a stretch of the central Paseo de la Reforma boulevard. Streets were blocked off in the area, and 2,000 police officers were on hand for security.
The lineup includes a mix of Latin pop and balladeer Jorge "Coque" Muniz, with cumbia band Los Angeles Azules heating things up after a midnight fireworks show.
New year celebrations ring in 2017 around the world
Revelers on the United States' west coast cheered the advent of the new year and said good riddance to 2016.
Celebrants in Los Angeles, San Francisco and Seattle -- eagerly turning the page on a year roiled by a bitterly partisan election -- caroused, sang, hugged, kissed and danced to standards like "Auld Lang Syne" as they welcomed the Happy New Year.
Tens of thousands of people packed LA's Grand Park and Music Center to welcome 2017 amid increased security after a deadly attack in Turkey early New Year's Day.
Revelers on the United States' west coast cheered the advent of the new year and said good riddance to 2016.
Ben Von Klemperer took in the heightened security as the gates opened more than 12 hours before the big celebration.
Mother Nature cooperated -- somewhat -- with temperatures climbing from the high 30s to the low 40s during the afternoon hours.
Many bundled up on cordoned-off streets to claim their positions hours before Gotham's traditional midnight ball drop.
President-elect Donald Trump delivered a end-of-year message to his fellow Americans -- via Twitter, of course:
"Happy New Year to all, including to my many enemies and those who have fought me and lost so badly they just don't know what to do. Love!" he said.
New Year celebrations: Global festivities welcome 2017
From Sydney to Moscow, Paris to New York, crowds said goodbye to 2016, a tumultuous year in global politics.
Many cities stepped up security for New Year's Eve celebrations, after a year in which attackers drove lorries into crowds in Nice and Berlin.
Thousands of extra police have been on duty in London and other cities.
But it did not stop tens of thousands lining the River Thames to watch a fireworks display with one very clear message after the country voted to leave the European Union: "London is open."
It also failed to dampen spirits in Paris, where about 500,000 people poured into the Champs-Elysees, where the Arc de Triomphe was lit up with a colourful countdown and the word "welcome" in dozens of languages.
Revellers in Berlin were undeterred by the recent terror attack at a Christmas market, gathering for a series of concerts before a midnight fireworks display.
Some 2,000 police watched over the around two million people enjoying a fireworks display on Rio de Janeiro's Copacabana Beach which had been shortened this year due to a severe economic crisis.
But the 17,000 police officers on duty in the Turkish city of Istanbul were unable to prevent an attack on a nightclub less than two hours into 2017, which left at least 39 dead.
Pacific islands including Samoa, Tonga and Kiribati were the first to enter 2017 at 10:00 GMT, followed an hour later by Auckland, where fireworks erupted from the 328m (1,080ft) tall Sky Tower in the city centre.
The iconic midnight fireworks display at Sydney Harbour in Australia paid tribute to Prince and David Bowie, two music superstars who died in 2016.
Seven tonnes of fireworks were set off in two displays watched by about one and a half million people.
Police said he was charged with a "crimes act offence, but not a terrorist offence" and there was no continuing threat to the community.
Israel has also warned its citizens travelling in India to avoid crowds, saying there is a risk of imminent "terrorist attacks".
Meanwhile, US President-elect Donald Trump tweeted new year greetings, including to his "many enemies".
Mr Trump will be sworn in as US president on 20 January.
A "leap second" was added to the countdown just before midnight in countries in the GMT timezone, such as the UK, to compensate for a slowdown in the Earth's rotation.
The extra second occurred just before clocks struck midnight and a time of 23:59:60 GMT was recorded, delaying 2017 momentarily.
This is required because standard time lags behind atomic clocks.