(CNN) -- Three Florida teens were arrested Thursday on charges they sexually assaulted a female classmate aboard a school bus parked at the high school they attend.
Branden Allen, 18, was arrested on charges of sexual battery related to a school bus incident in Florida.
The Pinellas County Sheriff's office said Branden Allen, 18, of St. Petersburg, Florida, a 16-year-old boy and a 15-year-old boy were arrested late Thursday on charges of sexual battery and false imprisonment.
Authorities say that on Tuesday at about 6:15 p.m., the three suspects and a female student at Dixie Hollins High School in St. Petersburg were aboard a bus that leaves the school late each day to transport students who play sports and take part in other after-school activities.
Allen boarded the bus, followed by the victim, who was taking a seat for a ride home, according to the sheriff's office. Authorities say the two younger male teens then boarded the bus and acted as lookouts as Allen "sexually battered the victim despite her resistance and protestations."
The attack stopped when other students arrived to ride the bus, the sheriff's office said. Detectives said the bus driver had left the bus, with the door closed, to round up students who were running late.
Police did not release an age for the alleged victim.
Allen was taken Thursday to the Pinellas County Jail while the two younger teens were transported to a juvenile center, the sheriff's office said.
The investigation is continuing, according to the sheriff's office.