BBC News......It is understood the most likely military response to Wednesday's suspected chemical weapons attack would be a one-off or limited guided missile strikes on Syrian military targets fired from US Navy warships.
Mr Cameron has spoken to a number of foreign leaders over the bank holiday weekend, including US President Barack Obama and his French and German counterparts.
The prime minister and Mr Obama agreed the need for a "firm response" from the international community to the attack.
Downing Street said Mr Cameron had used a phone call with Russian President Vladimir Putin to tell him there was "little doubt" a chemical weapons attack had been carried out by President Bashar al-Assad's regime.
But Mr Putin told him they had no evidence an attack had taken place or who was responsible, it said.
'Fabricated' footage
Russia, a key ally of Syria, has warned any intervention without a UN mandate would be "a grave violation of international law".
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