Janesville Police say they have arrested a 20-year-old man for allegedly sexually assaulting a child.

Nicholas Ackerman faces charges of sexual assault of a child, child enticement, possession of THC, possession of drug paraphernalia and a probation violation.

According to police, the 13-year-old victim agreed to meet Ackerman in the 1900 block of Center Ave. on Jan. 20th.

When they met, she got into Ackerman's car and they drove to the 800 block of S. Washington St. Once there, Ackerman allegedly sexually assaulted the victim, then released her.

Police say Ackerman and the victim had chatted for a couple of weeks online.