The international chemicals watchdog is to investigate claims surrounding the alleged use of chlorine by the Syrian government against its citizens.
The mission, which is set to depart "soon", has been agreed to by the Syrian government, the Organisation for the Prohibition of Chemical Weapons said in a statement.
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Nearly 38,000 runners will hope to complete Sunday's London Marathon making it the biggest event in its 35-year history.
Rain across central Britain with longer, intense downpours with thunder in places this evening. A lucky few will stay sunny and dry.
Planning on going to the London Marathon tomorrow? Read our handy guide first!