Foreign Secretary William Hague has tweeted:
Strong common ground in Doha on aid and a political solution, cannot be achieved if Assad thinks he can destroy the democratic opposition
More top news
Ireland's new laws on gay marriage will be enacted by the end of July, with the first ceremonies likely in the autumn.
Stars such as Simon Cowell and Stephen Fry called on their Twitter followers to retweet missing person appeals for 24 hours.
Norwich have been promoted to the Premier League after a 2-0 victory against Middlesbrough at Wembley Stadium.