The story

Thousands of demonstrators marched through cities across Europe on Saturday, calling for an immediate end to Israel's attacks on Gaza.

Up to 20,000 people were gathered outside the Israeli Embassy in London, England, at the peak of protests there, London Metropolitan Police said.

A police officer was knocked unconscious Saturday night as the protests turned unruly, the police said. Read full article »

CNN's Rachel Streitfeld and Mona Larijani contributed to this report.

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