A video released by Connecticut police appears to show a sergeant stomping on the head of a handcuffed man who was on the ground.

The video was taken June 4 during the arrests of Ricardo Perez and Emilio Diaz after a car chase from Hartford into West Hartford. Police say Perez struck a detective with a stolen car and damaged four police cruisers.

Booking photos show the men with serious facial injuries.

The Hartford Courant reports (http://cour.at/2dSFLEA ) the video released Wednesday appears to show Sgt. Sean Spell drop his left leg onto a man's head. It's unclear if the man was Perez or Diaz. Authorities say Spell is now retired.

A prosecutor is investigating whether officers used excessive force.

Spell, Perez and Diaz can't be reached for comment.

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Information from: Hartford Courant, http://www.courant.com