RIVERDALE, Ill. (WBBM/CBS) – Police in south suburban Riverdale are asking for the public’s help in finding a man who sexually attacked two teenage girls last week.

As WBBM Newsradio 780’s Bernie Tafoya reports, Riverdale police have released a new sketch of the man who sexually assaulted two 17-year-old girls Thursday evening.

He is described as an African-American man in his mid-20’s, about 5-foot-8, wearing dark clothes and having a mustache.

LISTEN: Newsradio 780’s Bernie Tafoya reports

Police believe the suspect attacked two 17-year-old girls Thursday night, as they left a Pace bus stop around 142nd and Halsted streets, when a man forced them into a nearby yard and walked to their homes a few blocks away.

After the attack, the man ran away, and the girls ran to a home and asked for help.

The day before, a woman reported fending off an attack from a man who matched the same description. The man ran away after the startled woman began screaming.

There were also two sexual assaults late last month, a few miles away from Riverdale.

The suspect’s description in those cases is similar to the latest attack, but police are not saying yet if they’re linked.

Anyone with information should call Riverdale police at (708) 841-2203.