Police say a 15-year-old girl was sexually assaulted in the 6000 block of Wister Street after leaving a friend's house.
Police released surveillance video where the suspect can be seen riding a bike. He appears to be looking to see if anyone is around before he drops the bike and backtracks towards the 15-year-old girl.
The victim told police that she noticed a man riding a bike while she was walking, but when she past an alley, the same man approached her with a gun and told her not to look at him.
Police say he then produced a gun, told the victim not to look at him, dragged her into an alley where he raped her.
The suspect is described as a black male, 5'9", with an average build, and light complexion. He was last seen wearing a dark colored hooded sweatshirt and dark colored pants.
"It's sad. I have a daughter that is 17. I can't imagine what her family is going through," said one neighbor.
"It's not safe out here at all," said Enile Hargett.
Enile Hargett is a mother of 7 and has a 14-year-old daughter. She lives just a few steps from the crime scene and hadn't heard about the sexual assault. She worries about her daughter.
"I'm going to tell her what happened and to be mindful and be careful," said Hargett.
Police are urging women and young girls to walk in groups and to pay attention to their surroundings.
Anyone with information is asked to contact the Philadelphia Police Special Victims Unit at 215-685-3251.