LOS ANGELES — Los Angeles Police Chief Charlie Beck released surveillance video Wednesday in hopes that the public can identify a man they says is a suspect in the shooting of two detectives.

The black-and-white video shows the man carrying what authorities believe to be the revolver used to wound two detectives who were ambushed outside the LAPD's Wilshire station early Tuesday.

Hundreds of officers sealed off 25 blocks of the busy Mid-City area for hours and detained 10 people but never found the gunman.

The manhunt was followed by an apparently unrelated shooting hours later, when two officers were shot during a probation check at a Willowbrook home. After an all-night standoff, the suspected gunman was found dead Wednesday.

The attacks happened hours apart and sent police swarming to Los Angeles neighborhoods, disrupting thousands of people. They appeared to be unrelated, police Cmdr. Andrew Smith said.

In the latest assault, authorities conducting a routine probation check were searching the Willowbrook home at about 7:30 p.m. Tuesday when a man inside shot an LAPD gang officer in the face and grazed the leg of a probation officer, Smith said.

The officer underwent surgery and was recovering in hospital intensive care, Smith said.

At least five officers exchanged shots with the gunman, and police sealed off the unincorporated county area about 10 miles south of downtown.

Neighboring homes were evacuated while officers tried to contact the gunman without success.

Police fired tear gas into the home and used a robot to examine it before a SWAT team finally entered and found a man dead in the attic shortly before 9 a.m. Wednesday, Smith said.

The man, whose identity wasn't immediately released, had several gunshot wounds, but it was unclear whether he died from police bullets or killed himself, Smith said. It also was unclear how long he'd been dead.