Twenty-two middle school students were treated at three local hospitals after a school bus they were riding on rolled over on Interstate 95 in Waltham, State Police said.

 

The bus was carrying student from Curtis Middle School in Sudbury when it collided with a pickup truck on the busy interstate just south of Route 20 and flipped over a guardrail. All injuries are believed to be minor, police said.

 

Ten students were taken to Boston Children's Hospital and others were taken toNewton-Wellesley and St. Elizabeth's hospitals.

 

State troopers are investigating the crash.