The international chemical weapons watchdog has said that it is studying details submitted by Syria about its arsenal of poison gas and nerve agents.

But a spokesman for the Organisation for the Prohibition of Chemical Weapons said it was expecting more details from Damascus, ahead of a deadline for submissions by the end of today.

Syria has agreed to provide a full list of its chemical arms by then.

It is believed to have around 1,000 tonnes of chemical toxins.

Its entire chemical weapons arsenal is meant to be dismantled by the middle of next year under the terms of a US-Russia brokered deal.