Hundreds of people have joined a rally to denounce Britain's air strikes in Syria against Islamic State.

The Stop The War protesters, who gathered at BBC Broadcasting House in London and planned to march to Downing Street, took particular aim at the 66 Labour MPs who crossed the floor to secure the green light for action, the Daily Mail reported on Saturday.

The Socialist Party supplied an open microphone for the event, with over a dozen speakers lining up to voice their anger under the watchful eyes of police.

Sources: MENA