Police in Park Forest have issued a community alert after several teenaged girls were harassed by a man carrying a knife.
Four incidents have been reported, and police say the same man may be responsible for the attacks.
Each girl was walking alone at the time.
The most recent incident happened when a 13-year-old girl was walking to Forest Trail Middle School.
Police say some of the victims were groped, robbed or threatened with a knife.
In the most recent incident, the offender was described a Black male, 5’8”, with a medium build. The man was wearing a dark colored ski mask over his face, dark sunglasses, a gray zip-up hoodie, blue sweatpants that appeared to be dirty and white gym shoes, police said.
Anyone with any information is asked to call 708-748-1309.