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CHICAGO — An 11-year-old girl was sexually assaulted in a Chicago Public Library branch by a man who reportedly caused a disturbance at the same library in the past.

The incident happened around 4 p.m. Monday at the Walker Branch in the 11000 block of South Hoyne in the Morgan Park neighborhood.

Police said the 25-year-old man entered the corner room of the library as the girl’s mother walked out. He sat next to the girl and sexually assaulted her, according to police. The man then fled on foot.

A Chicago Public Library spokesman told WGN the man caused a disturbance in September and was asked to leave. Police were called after he refused to leave, but he was not banned.

The library cannot ban anyone without a court order because it’s a public place.

The girl was transported to Little Company of Mary Hospital in stable condition.

Joy Nelson was in the library Monday night with her daughter and saw all the commotion, but had no idea what was going on.

I couldn’t understand ’cause I thought it happened away from the library,” Nelson said. “I didn’t think that it would happen inside the library when it was a lot of people up in there last night.”

News of the assault has parents shocked and upset.

“It’s for kids to come learn and be off the streets,” mother Angie Ford said. “So a child getting assaulted like that, it’s outrageous and unheard of in a library.”

The man was arrested by police, but charges have not been filed yet. Area South detectives are investigating.