World
New Year celebrations: Global festivities welcome 2017
Fireworks have lit up the skies over some of the world's most iconic landmarks as people across the globe gather to welcome the New Year.BBC
Fireworks have lit up the skies over some of the world's most iconic landmarks as people across the globe gather to welcome the New Year.
From Sydney to Moscow, Madrid to Rio, crowds gathered to say 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."
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.
On Friday a man in Sydney was charged in connection with threats made against Sydney's New Year's Eve celebrations.
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".
'Many enemies'
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.