CRANSTON - A UMass Dartmouth student is under arrest for groping his former high school teacher.

Cranston Police say Adam Yidana, 18, has been charged with sexual assault after entering Cranston West High School last Friday as current students were leaving for the day.

Police say Yidana approached a former teacher and repeatedly asked her for a hug and told her she was beautiful. The teacher refused the hug. That's when police say Yidana grabbed the teacher's breast.

Police say the sexual assault was an isolated incident.

Yidana was arrested Thursday at UMass Dartmouth and was arraigned at the Cranston Police Department.