Around 2:30 p.m. Wednesday, a man driving on Camino Pablo contacted a male student walking in front of the school and asked if he needed a ride home, police said.
The student said no, and the man drove off toward Canyon Road.
Police said the same driver had been spotted in the area about two weeks ago asking another student if he wanted a ride home.
The suspect is described as a clean-shaven, college-age white man driving a brown pickup truck with a camper shell, according to police.
Anyone who sees the suspect vehicle is asked to call Moraga police at (925) 284-5010.