Russia and China have stepped up their warnings against military intervention in Syria, with Moscow saying any such action would have "catastrophic consequences" for the region.

The US and its allies are considering launching strikes on Syria in response to deadly attacks last week.

The US said there was "undeniable" proof of a chemical attack, on Monday.

UN chemical weapons inspectors are due to start a second day of investigations in the suburbs of Damascus.

The UN team came under sniper fire as they tried to visit an area west of the city on Monday.

A spokesman for UK Prime Minister David Cameron says the UK is making contingency plans for military action in Syria.

Mr Cameron has cut short his holiday and returned to London to deal with the Syrian crisis.

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