UNITED NATIONS - International envoy Kofi Annan has asked the UN Security Council to delay a vote planned for later on Wednesday on a Western-backed resolution that threatens Syrian authorities with sanctions in a bid to end the 16-month conflict, Britain said.

"Joint Special Envoy Annan has asked to delay today's draft Syria resolution vote. With fellow co-sponsors (of the resolution) we're considering that request," the British UN mission said on Twitter.

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