A 43-year-old man has been killed outside a Philadelphia mosque in an execution-style shooting that's been condemned by Pennsylvania's governor.

Officers found the man,Benjamin Caldwell later identified as Raheem Jefferson, unresponsive on the ground with multiple gunshot wounds on Tuesday afternoon, including at least one to his head and multiple to his torso, according to the Philadelphia Police Department. He was pronounced dead at a nearby hospital shortly afterward.

The killer fired at least 17 shots using a large-caliber semi-automatic weapon, police Chief Inspector Scott Small said a news conference on Wednesday. Security footage reviewed by police shows Jefferson and another man walking to the Al-Aqsa Islamic Society for prayer service when a suspect approaches from behind before opening fire, Small said.

"It's all caught on camera," Scott told reporters. "The shooter stands over the victim from just a few feet away and continues firing shots at this 43-year-old victim while he lays on the parking lot. So clearly, an execution-type homicide."

Suspect remains at large with motive uncertain

No arrests have been made in the case and police haven't determined a motive but Small said it appears Jefferson was the intended target of the crime.

The shooter was seen getting into a vehicle and fleeing the parking lot while wearing dark-colored clothing, Small said.

A $20,000 reward has been offered for anyone with information that leads to the arrest and conviction of the suspect.

The shooting happened at the Al-Aqsa Islamic Society mosque, established in 1989 in the lower northeast neighborhood of Kensington. Its goal is to "maintain the Islamic Identity and to protect and sustain the Islamic Community in Philadelphia," according to its website.

Governor comments on shooting

Democratic Pennsylvania Gov. Josh Shapiro condemned the incident on X and shared his condolences.

"Violence outside of a house of worship is deeply painful and traumatizing for those simply showing up to worship and practice their faith," Shapiro wrote. "As an investigation into this killing proceeds, I'm praying for Philadelphia's Al-Aqsa Islamic Society community, a place I’ve been several times, and hoping they find peace in each other and in their faith."