An off-duty Philadelphia police officer shot and killed a man in a North Philadelphia bar early Sunday after a fistfight escalated into deadly gunfire, police said.

Police said two men began fighting about 1:30 a.m. on the second floor of the Myspace Lounge, in the 3300 block of Germantown Avenue.

One man pulled out a gun and fired, wounding the man with whom he had been fighting and fatally injuring a bystander, said Lt. Ray Evers, police spokesman.

The off-duty officer, who was in plain clothes, witnessed the altercation and pulled out a firearm as the assailant was about to leave the lounge, and ordered the man to drop his gun, Deputy Commissioner Richard Ross said.

"He announced himself as an officer," he said.

The assailant wheeled and fired in the officer's direction, Ross said. The officer, who was assigned to the Police Athletic League unit, fired three times, striking the man, Ross said.

Witnesses identified the assailant as Raheem Rose, 22. He stumbled out of the lounge and died during surgery at Temple University Hospital, whose emergency room is near the lounge.

Off-duty officer intervenes in gun fight, killing a man in North Philly bar | Philadelphia Inquirer | 02/14/2011