It happened just before 6 a.m. Wednesday on the 500 block of West Somerville Avenue near North Fairhill Street.
According to police commissioner Danielle Outlaw, an officer went upstairs to check on a possible victim when a person began shooting at the officer and another man.
The 68-year-old man was shot once in the neck, police said. He was taken to Einstein Medical Center where he was listed in stable condition.
Officers also found a 38-year-old man who had been shot twice in the head. He was also taken to Einstein Medical Center where he is currently listed in critical condition.
Shots fired Philadelphia police officers
Police declared a barricade at 6:09 a.m., and the Philadelphia Police Department SWAT Unit was called to the scene. Officers were able to clear the house by 6:46 a.m.
A person was arrested and a weapon was recovered, police said. Officers did not fire their weapons.
No officers were injured.
The investigation is ongoing.