Syrian rebel fighters have alleged that the Assad regime launched "a series of chemical attacks" on the Damascus suburbs of Adra and Douma yesterday morning.
Video posted on YouTube purports to show victims suffering from a range of symptoms associated with chemical weapon use.
ITV News cannot independently verify the social media content.
The use of chemical weapons is banned under the Geneva protocol.
More top news
The Prime Minister will urge leaders of the other 27 EU states to move on as quickly as possible to talks on Britain's future trade.
Despite temperatures reaching double figures in the south today, it was still a chilly day, with brisk winds.
The four-time Tour de France winner has said he has always taken great care to stay within the rules after returning an adverse urine test.