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Detroit • He appears calm as he walks into the police station, as if he belongs there.

He steps past vending machines, to the far side of the horseshoe-shaped front desk from the door. Lamar Moore is just out of the frame when he fires his first shotgun blast. Officers hit the floor and smoke curls into view.

The graphic surveillance video of Moore's ambush on the Detroit Police Department's Northwestern District station Sunday was released Friday, bringing into the public's view the attack that left four officers injured and Moore dead.

It's a video that shows a sudden, gruesome attack on police by a gunman implicated in an alleged sex crime and kidnapping. It also shows the heroics of Cmdr. Brian Davis, who engaged Moore in a point-blank shoot-out.

All four officers are recovering from their injuries.

"There were tremendous acts of heroism that rarely individuals get a chance to see," Detroit Police Chief Ralph Godbee Jr. said in a video message. "Detroit police officers in action."

It was a normal Sunday at the station.

"It was very shocking to see," Detroit City Councilman James Tate said of the video. He said the department should recommend new security measures. He favors metal detectors.

"It didn't take the video for me to realize that there needed to be review of the security policies at the various police facilities," said Tate, who worked in communications for the department before being elected to the council in 2008.

The gun battle is over, but another fight has started for Davis and Officer David Anderson, who were released from the hospital Thursday and Friday, respectively. Both will need physical therapy, doctors said. Sgts. Ray Saati and Carrie Schulz were also wounded.

Godbee said he wanted to release the video to maintain a commitment to transparency and show the public the inherent dangers that come with police work.