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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The 29-year-old PR manager, who had appeared on Come Dine With Me, was killed days before leaving for a two-month trip to the US.
The Square has won the top prize of Palme d'Or at the Cannes Film Festival.
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