On Friday, the Guardian Angels were in the neighborhood escorting children to school.
The victim told police she was raped at gunpoint after the suspect approached her from behind.
The victim describes her attacker as a 17-year-old male who is about 5'7" and 120 pounds. She said he was wearing a black skull cap, a hoodie, blue jeans and tan Timberland boots.
Police say on Wednesday morning at around 9, he engaged her in conversation, pulled the gun and then forced her into a nearby yard where he raped her.
According to detectives, he ran away when a stranger came to help the girl. A similar rape happened last week in West Englewood involving a 13-year-old girl.
There have been three sexual assaults on the city's South Side in two weeks.
Sheila White lives near 95th and Prairie close to the crime scene.
"I'm thinking nobody would have been able to hear her, from this area off of 95th Street, because there's traffic going east bound and west bound," White said.
In addition to escorting students to Harlan Community Academy, the Guardian Angels were also handing out sketches of the suspect.
"Some guy is preying on women in the area," said Thomas Hunt of the Guardian Angels. "He comes along and tries to give them a little rap or something and then sticks them up at gunpoint. We want them to be aware."
Student Ariel Campbell said she appreciated what the Guardian Angels were doing.
"I actually feel as if this is a really good thing for them to be doing, because, you know, there's not a lot of people out here that care, and this shows they really care about the young ladies out here," Campbell said.
Police are asking for the public's help in this case. They hope someone recognizes the man in the sketch and calls authorities. Meanwhile they have not said if the two separate rapes are linked.
"Just be careful and watch my surroundings and if anything happens scream and yell and call for help," said Neena Goines