A school bus that left Rockledge Elementary School in Lake Ridge carrying children caught fire under the hood.
The children were evacuated and fire and rescue crews were called to meet the bus near the intersection of Old Bridge Road and Harbor Drive.
More from Prince William County Public Schools spokeswoman Irene Cromer:
Rockledge Bus 232 had a mechanical issue and another bus, #76, transported the children home. There was minimal delay in the normal bus schedule.
The children that were off-loaded from bus 233 were loaded onto bus 76 by 4:30 p.m., according to initial reports.
Another Prince William County school bus broke down Thursday afternoon in the area of Hoadly Road and Galveston Court near Dale City. Fire crews were called for what was reported to be a fire under the hood, but they found a broken belt and no fire.
On Wednesday, another county school bus hit a parked police car in Woodbridge.