STAMFORD - Two middle school students in Stamford have been expelled and two others have been suspended for allegedly sexually harassing a 13-year-old girl on a school bus.

The victim's mother tells News 12 Connecticut it happened March 10 on the bus ride home from Cloonan Middle School.

She claims one of the boys held her daughter's head into another boy's crotch, lifted up her shirt and hit her.

School officials tell News 12 Connecticut that a camera on the bus enabled school officials to deal with the matter quickly and discipline the students accordingly.

Police say they are still investigating the incident.