The US Secretary of State John Kerry said the continued violence in Syria showed that it was time for President Bashar al-Assad to go.
Speaking alongside Kerry, Foreign Secretary William Hague called for support for Syria's opposition to be increased significantly to bring the conflict to an end.
More top news
There was no White Christmas but here's a look at the best Boxing Day snow scenes.
Actor Dustin Diamond allegedly stabbed a man in a bar in the US after getting into an argument on Christmas Day.
Over the next 24 hours we are going to see snow and ice across many parts, although it is looking calmer from Sunday onwards.