The Foreign Secretary William Hague has warned that the UK does not rule out any options if it in the interests of saving Syrian lives.
He said that Syrian president Bashar al Assad should not doubt Britain's resolve to react if he decides to use chemical weapons.
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More than 100 leaders have declared their support for a Conservative-led government, warning a Labour would "put the recovery at risk".
The winds will remain strong tonight and in the north showers will continue, which may turn wintry over high ground.
A deadline for a deal on Iran's nuclear development came and went at talks in Switzerland but there is still hope.