Ypsilanti police say a library patron took off his clothes and exposed himself to an employee today before fleeing with children's books in hand.

The man hasn't been located by police.

The 58-year-old employee told police she was working in the Ypsilanti District Library in the 200 block of West Michigan Avenue at 10:30 a.m. and assisted a man in making book selections.

She returned to her desk and looked up to see the man step out from behind a bookcase, completely naked, a police press release said. The man "thrust his hips in the direction" of the woman, but didn't make any other movements toward her, the release said.

The employee went upstairs and called police. By the time officers got there, the man had fled through an emergency exit, taking his clothes and the children's books with him, the release said.

The man was described as black, 30-40 years old, 5 feet 8 inches tall, 160 pounds and had a mustache. He was wearing a brown coat, blue jeans and a knit cap when he entered the library.

Anyone with information is asked to call Ypsilanti police at 734-483-9510.