MPs voted against Labour's amendment demanding "compelling evidence" that the Syrian regime was responsible for using chemical weapons against civilians before Britain takes part in military action against President Assad's government.
There were 332 votes against the amendment and 220 in favour of it.
International Development Secretary Justine Greening claimed she missed the crucial vote on Syria because she did not hear the division bell
Britain's place in the world changed with last night's Commons vote on Syria, as David Cameron spectacularly misread his own party.
It was clear the majority of MPs would not be prepared to back unilateral action by the US and Britain. Today we need to make clear why.