Officers say they saw one of the suspects firing shots.
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Police believe the two shootings, which took place 15 minutes apart, are unrelated.
The first shooting happened just before 10:30 p.m. Thursday on G Street, near East Allegheny Avenue in the city's Kensington section.
That's where police found a 15-year-old girl who they say was shot in both of her thighs.
Officers rushed her to the hospital in critical but stable condition; she is expected to survive.
Police believe the girl may have been an innocent bystander struck by stray bullets.
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About 15 minutes later, while police were investigating that shooting, they heard gunshots go off a half a block away on the 800 block of East Allegheny.
That's where they say they saw a 29-year-old man firing shots and ordered him to get on the ground.
They noticed the shooter had been shot.
"They realized that 29-year-old who was firing shots was also shot in both of his legs and that 29-year-old claims he was shot by a vehicle and was returning fire," Philadelphia Police Chief Inspector Scott Small said. "Right now, he is a victim, but he's also in custody for having a gun and firing a gun. Preliminary information, he does not have a valid permit to carry."
As for the 15-year-old victim, she joins dozens of other young victims of gun violence across the city.
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As of Wednesday, 80 children under 18 have been shot in the city - 72 of them are boys, 8 are girls, with the latest victim becoming the 9th.
Eleven juvenile shooting victims have died so far this year - all of them boys.
There is a curfew for minors that goes from 10 p.m. to 6 a.m. Action News has found that the vast majority of these young shooting victims have been shot during the time they are allowed to be outside.
RELATED: Check the 6abc Neighborhood Safety Tracker