Tribune: Man in Custody After Sexual Assault on Sunday

Another scary one (via Tribune):

One man is in custody after he sexually assaulted a woman in a South Loop building Sunday morning, according to Chicago police.

Police responded to a report of criminal sexual assault in the first block of East 16th Street just before 6 a.m. Sunday. When officers arrived, a 31-year-old woman told them a man had sexually assaulted her after somehow gaining access to a residence, police said.

The man fled when a witness interrupted the incident, police said, but he was placed into custody soon after by the responding officers.