A man who confessed to shooting a Philadelphia police officer multiple times “in the name of Islam” used a stolen police gun and pledged allegiance to ISIS, authorities said Friday.

“This is absolutely one of the scariest things I’ve ever seen,” Philadelphia Police Commissioner Richard Ross said of surveillance footage that captured Thursday night’s bloody encounter in West Philadelphia. “This could have easily been a police funeral.”

Ross said 33-year-old Officer Jesse Hartnett was driving in a marked cruiser through the intersection of 60th and Spruce Streets in West Philadelphia when Edward Archer, 30, walked up to the police cruiser and opened fire around 11:45 p.m.

While continuing to shoot, the suspect continued closing in on the police car until he was actually firing from inside the driver’s side window while Hartnett sat behind the wheel, according to Ross.

During a news conference Friday afternoon, Ross said the Archer’s weapon was a police firearm stolen from a home in October 2013.

The suspect fired about a dozen times, emptying the 9mm handgun he was shooting, Ross said. The commissioner said Thursday night the suspect fired 13 times, but said during a press conference Friday at least 11 shots were fired.

Hartnett underwent surgery shortly after the shooting. He was out of the operating room Friday morning and was in “good spirits” and talking. Ross said the officer’s injuries are considered “very serious” and will require multiple surgeries.

Ross said Archer has a criminal record and has addresses in Yeadon and Philadelphia, which will be searched by the FBI and Department of Homeland Security. The suspect was treated at the hospital and later released into police custody.

(AP / NBC News)