Some 5,000 people protested in London Saturday against potential British participation in Syria airstrikes, as political momentum mounted to broaden the fight against "Islamic State" (ISIS) terrorists, AFP reports.

Prime Minister David Cameron on Thursday laid out the case for British jets, already bombing ISIS targets in Iraq, to join France, the United States and others in targeting ISIS strongholds in neighboring Syria. Yet Britain remains deeply scarred by its former interventions in Afghanistan and Iraq, the latter drawing hundreds of thousands of protesters onto the streets of London in 2003.

In an echo of that protest, thousands gathered in the British capital carrying placards reading "Don't bomb Syria", "Drop Cameron, not bombs", and "Don't add fuel to the fire".