GERMANTOWN, MD — A track coach at Seneca Valley High School in Germantown faces sexual offense charges for allegedly having sex with a 14-year-old girl from Anne Arundel County, authorities say. Onaje Robinson, 42, of the 12900 block of Falling Water Circle in Germantown, has been charged with two counts of a third-degree sexual offense and one count of second-degree assault.

Mark Cohen, principal at Seneca Valley, said in a letter sent to parents Wednesday that the allegations are "troubling and unacceptable." The administrator said that as soon as school officials learned of the police investigation, Robinson was placed on unpaid leave and the school system is cooperating with police. Robinson is an assistant indoor and outdoor track coach. Authorities have asked any other victims to contact police.

The Anne Arundel County girl told police that she met Robinson on social media. After about a week of communication, the two agreed to meet. Investigators say that early on Aug. 20, Robinson drove to the victim's home, then the pair drove to his apartment, where they had sexual intercourse. The girl told police that Robinson knew she was 14.

Robinson turned himself in to Montgomery County Police Tuesday evening; he was taken to the Central Processing Unit and was released on bond. Anyone with information about this case or additional victims is asked to call police at 240-773-5400.