David Cameron said he has not ruled out stepping up action against the Syrian regime after growing evidence they were using chemical weapons, according to Reuters.
Cameron told NPR radio: "Certainly we haven't ruled out stepping up action in response to what seems to be happening on the ground.
"The evidence is growing; the lack of room for doubt is shrinking, and I think this is extremely serious."
The Prime Minister said he would raise the issue with US President Barack Obama at their meeting today.
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Western areas will see the rain first but by the end of the day it will also have spread eastwards.