Violent protests raged overnight on Friday as anti-capitalist protesters faced off against police across central Hamburg where the leaders of the world’s 20 most powerful countries were attending a two-day summit.

Police deployed water cannons and called in reinforcements from around Germany to help stifle escalating violence as people began looting supermarkets and other premises and torching vehicles on the streets.

A cash machine was burned out and several police helicopters patrolled overhead.

Police earlier said at least 196 officers were injured in the clashes, with 83 protesters temporarily detained at the scene and 19 taken into custody.

The protests marred a gathering that German Chancellor Angela Merkel had hoped would demonstrate her country’s unshakeable commitment to freedom of speech and assembly.