Commissioner Richard Ross provided that update during a news conference on Friday afternoon. He said there was no indication from the suspect, 30-year-old Edward Archer of Yeadon, that he was involved in a conspiracy.
Archer had pledged his allegiance to ISIS, officials say. Ross called the shooting "an attempted assassination of a police officer."
Also at the news conference, Mayor Jim Kenney said the shooting had nothing to do with "being a Muslim or the Islamic faith."
Last night?s shooting had nothing to do with any faith. It was a violent assault by a criminal. I urge all Philadelphians to stand together.— Jim Kenney (@PhillyMayor) January 8, 2016
Ross went on to say that Archer "stopped short of implicating anyone else in the attack," adding Archer was "very evasive."
Ross also said the gun used in the shooting was a police firearm that was previously stolen from a home. That officer had been disciplined, Ross said.
The shooting happened 11:40 p.m. on Thursday.
Surveillance images show a man, identified as Archer, approaching the driver's side window of Officer Jesse Hartnett's vehicle.
Images show the suspect pointing a gun at Hartnett's vehicle, while another shows what appears to be the muzzle flash as he fires.
Another image shows the gunman with his arm in the vehicle.
Ross said there was no advance warning to the officer and that the suspect "just started firing."
Hartnett, 33, is a five-year veteran of the force. He suffered extensive injuries to his arm, but authorities say he was awake and alert prior to that surgery.
Police say the suspect fired a total of 13 shots, three of which hit Hartnett in the arm.
Hartnett was able to return fire, striking the suspect three times, police say.
"I just have to tell you, when you look at the video - we have video that captured all of this - it's one of the scariest things I've ever seen," said Ross. "This guy tried to execute the police officer. It's amazing he's alive."
The moments immediately following the shooting were also captured in a dramatic recording of police radio calls obtained by Action News overnight.
"I'm shot! I'm bleeding heavily!" Hartnett was heard saying.
The officer's father, Robert Hartnett, got to the hospital right away. After surgery, after his son woke up they were able to speak.
"I love him and very proud of him. He's an excellent person," Robert Hartnett said.
Hartnett grew up in East Lansdowne with three siblings. He went from the Coast Guard to the police academy.
"His spirits are positive," Richard said, saying his spirits are positive, "now that I see he's waking up. It will be a tough road. But he's a tough guy."
The Associated Press contributed to this report.