IOWA CITY &#8212 A Chicago man was arrested for allegedly sexually assaulting a woman in Iowa City, police said.

Antonio Mikhal Johnson, 21, was charged with third-degree sexual assault, possession of marijuana and second-degree robbery.

Police said the victim told investigators she was attacked and robbed just before 2 a.m. Friday. A cell phone and money were stolen, police said.

The victim said she did not know Johnson.

It was the latest reported sexual assault in or near the downtown area in the past year, police said.

Some of the assaults appear to be related, police said.