New York ? A fiery head-on collision killed five women in a sport utility vehicle less than a week after they graduated from a high school in the Rochester suburb of Fairport, the principal said Wednesday.

Their Chevrolet Trail Blazer had just passed a vehicle late Tuesday when it swerved back across the two-lane road into oncoming traffic and hit a tractor-trailer, the Ontario County Sheriff’s Office said. Both vehicles caught fire.

The crash knocked down utility lines and cut phone service in the western half of Ontario County. The truck driver wasn’t injured.

The victims were pronounced dead at the scene, deputies said.

Fairport High School Principal David Paddock said four of the women were members of the cheerleading squad – Bailey Goodman, Hannah Congdon, Meredith McClure and Sara Monnat – and he identified the fifth as Katie Shirley. All five graduated Thursday.