It's unclear what the man was being detained for, but the footage shows him lying face down as three officers held him on the ground.
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One of the officers then hits him twice in the head. The suspect's hands appeared to already be behind his back.
Officers also appeared to use non-lethal force before he went to the ground. A Taser could also be heard being deployed in the video.
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Eyewitness News reached out to the Anaheim Police Department for more details, but has not heard back.