Further far-right protests, of the kind seen in Cologne on Sunday, are being planned in Berlin and Hamburg, leading to fears of violence spreading to other cities.

The scale and violence of what was billed as an anti-Salafist demo caught police by surprise on Sunday. Forty-five people were injured in fighting around the "Hooligans against Salafists" march, 44 of them police officers, and 17 people were arrested.

Police used tear gas and water cannon to try to control more than 4,000 people who took to Cologne's streets.

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