(Huffington Post) A man was arrested Friday in the rape of a mentally disabled woman aboard a near-empty Los Angeles County bus during rush-hour commute.

Authorities believe Kerry Trotter, 20, boarded the bus with the 18-year-old woman on Wednesday at a stop in suburban Culver City before she was followed to the back of the vehicle and assaulted.

A witness – the only other passenger on board – tried to alert the driver but was unsuccessful, sheriff’s officials said without elaborating.

It was the third rape so far this year on county buses that annually carry millions of people.

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