A Marana High School senior was airlifted to a hospital with life-threatening injuries after her car collided with a garbage truck Friday, a Marana school district spokeswoman said.

The 18-year-old female student and the garbage truck hit each other shortly after school was released at 11:17 a.m., said Tamara Crawley, a Marana Unified School District spokeswoman. No other students or vehicles were involved in the crash.

The girl was turning northbound from Emigh Road, which runs outside of the school, onto Sandario Road, when she collided with the southbound garbage truck, said Officer Adam Lawson, a Marana Police Department spokesman.

Firefighters from the Picture Rocks Fire Department had to remove the girl from her Honda four-door sedan, he said. The driver of the garbage truck was not injured.

No citations have been issued and police are working to determine who had the right of way, Lawson said. Marana High School is located at 12000 W. Emigh Road, west of the Tucson Mountains.