In the video, a stun gun is heard being fired and a man falls to the ground at a park.
Two officers stand over the motionless man and begin kicking him. A third officer drives up and attacks him. No complaint was filed.
Bridgeport city spokeswoman Elaine Ficarra said Saturday that all three officers are on desk duty while authorities investigate the May 2011 encounter. The officers are all 10-year veterans of the police force.
The video was posted on YouTube this month. It's not clear who's filming or who posted the video.
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