Chicago Police believe one man is responsible for two sex assaults that happened in less than two weeks, just blocks apart.
The latest victim is a 15-year-old girl.
The attacker was armed with a knife when he forced the girl into an abandoned house at 65th and Campbell and sexually assaulted her.
It happened around 10:20 p.m. Saturday.
On March 7th around 6:30 a.m., police believe the same man grabbed an 18-year old from behind and forced her into an alley near 65th and Western.
Anyone with information is asked to call Area Central detectives at (312) 747-8380.