(AP) — A 37-year-old western Nebraska teacher has been accused of sexually assaulting a 13-year-old girl.

Richard Cobos of Gering is being held in lieu of $500,000 bond. He was being held Thursday before a scheduled court appearance Friday.

Prosecutors say the girl Cobos is accused of molesting is not a student in the Mitchell school district, where he taught junior high math.

Police say Cobos assaulted the girl on several occasions between 2009 and 2012 when she was staying at his house.

Court records do not list a lawyer for Cobos because he hasn’t yet appeared in court.