Updated

Police in Philadelphia were searching Thursday for a man who killed two armored car guards servicing an ATM outside a bank early Thursday, authorities said.

"This person had no regard for human life at all," said Philadelphia police Commissioner Sylvester Johnson.

The victims, Joseph Allullo, 50, and William Widmaier, 65, were retired from the city's police department, where they had served more than two decades, and were lifelong friends, Johnson said.

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A surveillance tape showed the robber getting out of his car and putting on gloves before he shot one guard who was removing cash from the automated teller machine, Johnson said. The gunman then went around the armored car and shot the second guard as the victim tried to unholster his gun, police said.

"It was an assassination. He killed two people intentionally," Johnson said.

Mark Clark, a Loomis spokesman, said a third guard, the driver, was grazed by shattered glass as the robber tried to shoot through the armored car. He was treated for lacerations and released from a hospital.

Police said the suspect fled in a black Acura LT. No arrests had been made by early afternoon.

A short time after the shootings, police recovered a black duffel bag filled with cash behind the Turf Club, an off-track betting parlor directly behind the bank, said Officer Raul Malveiro, a police spokesman. Police did not have details on how it got there.

Investigators were trying to determine whether the guards, who were armed, exchanged fire with the robber, Malveiro said.

Entrances to and from the mall complex where the bank is located were shut down and police were stopping motorists leaving the area.

Several schools in the area were placed under lockdown amid a massive manhunt in the area. The mall also was shut down.

Johnson said police and the FBI were reviewing surveillance video from the bank, which is at a busy intersection of shops and other businesses.

Police said they are looking for a black man in his 20's, wearing a yellow baseball cap with a black logo on it and blue jeans.

The Associated Press contributed to this report.