British police arrested 20 people Friday outside the U.S. Embassy in London on suspicion of belonging to a banned group.

Scotland Yard said a total of 22 people were arrested during a protest over the American use of drones in Pakistan organized by a group calling itself "United Ummah."

Police said 20 people were arrested on suspicion of being members of a group banned by the Home Office. It would not say what group it believed the suspects belong to and the U.S. Embassy declined to comment.

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