One man was shot while sleeping in bed overnight in the Wynnefield section of the city.
Police say that just before 2 a.m. Friday, the gunman fired at least 17 shots at two homes on the corner of 53rd and Euclid. They say the shots were fired from a playground across the street.
The weapon of choice, authorities believe, was an AR-15, a high-powered assault rifle.
The victim was sleeping in the front bedroom of one of the homes when he was hit in the shoulder.
He was taken to the Hospital of the University of Pennsylvania where he is in stable condition.
Both houses are boarding houses and a total of 15 people live between the homes.
"The fact that there's 15 people [living in the homes] and only one was struck is pretty fortunate for the other 14...At this point we believe he is a totally innocent victim," Philadelphia Police Inspector Scott Small said.
Anyone with information on the shooting is urged to call Philadelphia Police.