A group of middle-school students was allegedly harassed by an unknown individual in a black mask Tuesday morning.

Officials at Pima Butte Elementary School sent out an advisory bulletin around 11 a.m. warning parents that around 8:20 a.m., a man in a black “ski mask” harassed the students as they waited for their bus near the corner of Van Der Veen Way and Rancho El Dorado Parkway.

The man, according to the bulletin, stopped his vehicle – a light-red Ford pickup truck – then got out and allegedly shouted something inaudible at a group of Desert Wind Middle School students waiting at the stop.

As a bus approached, the bulletin says, the man wearing the mask, black pants and a red, white and black striped collared shirt, got back in to the pickup and drove away.

“One of the witnesses on scene believes they knew who it was,” Maricopa police spokesman Ricardo Alvarado said.

MPD is pursing that lead, he said.

At this time, police believe the man does not pose any further threat.