Prime Minister David Cameron said there is a "growing body of limited but persuasive information" showing that the Syrian regime has used chemical weapons including sarin.
There is a growing body of limited but persuasive information showing that the regime has used, and continues to use, chemical weapons including sarin. The room for doubt about this continues to diminish. We will continue to take action on every front, working with our allies, backing the opposition, pushing for a political solution.
There is an urgent need to start a proper negotiation to force a political transition and to bring this conflict to an end. I will be flying to Sochi on Friday to meet with President Putin to discuss this issue further.
He said he had spoken with the US Secretary of State John Kerry on his return from Russia, and confirmed he will be meeting President Putin on Friday to discuss the crisis.
More top news
Britain's ugliest building is the Walkie Talkie in London, according to a public vote.
Britain's stance over taking in more refugees could hurt David Cameron's EU reform plans, a spokesman for Angela Merkel's alliance has said.
The inquest into the deaths of 11 people in the Shoreham air disaster is due to be opened and adjourned today.