Revellers have complained that they could not see London's New Year's Eve fireworks display because of smoke.
Thousands of people lined the banks of the River Thames to watch the display in front of the London Eye as the clock struck midnight.
More than 100,000 tickets were snapped up for the sold-out event and people were packed into the streets around Victoria Embankment to welcome the new decade.
But hundreds took to social media to bemoan the apparently smoke-filled spectacle, which London Mayor Sadiq Khan said would be "the best fireworks London has ever seen."
One person wrote: "Who else is watching the London Smoke Display? Were there supposed to be fireworks?"
Another said: "I hope everyone who queued hours to see the London fireworks enjoyed the whole 20 seconds they could see before the big cloud of smoke obstructed their view."
A third complained: "All the smoke.... Its rediculous (sic)....... It got in the way of the fireworks so we couldn't see them in London."
And another Twitter user wrote: "Happy New Year to all the people who waited for 5 hours near the Thames to see the London NYE fireworks only to get a view of just smoke."
Others posted memes and joked about the displayed with Chris Lennon saying: "Brilliant smoke display in London with a couple of fireworks thrown in..."
During this year's event, pyrotechnics featured more than 12,000 fireworks with the display set to a soundtrack “inspired by London and Europe” as the capital prepares to host several Euro 2020 games.
But smoke could be seen billowing across the Thames, obstructing the view of the crowds watching on the river bank opposite.
London welcomes in 2020
The soundtrack featured music from Stormzy, Wiley and Bastille.
Big Ben chimed the start of the display and the new decade by ringing 12 times, despite them being silent this year while renovation work is completed.
Scotland Yard also revealed that 15 people were arrested before 2am during the celebrations in central London.
