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US policeman 'seen hitting' woman in California

5 July 2014 Last updated at 16:29 BST

The California Highway Patrol says that it is investigating footage posted on YouTube that shows a policeman repeatedly punching the face and head of a prostrate woman.

Police say that the woman needed to be restrained and was endangering herself and motorists by walking on a busy road in the west of Los Angeles.

Chris Rogers reports.

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