FRESNO (AP) — Police in California say two students suffered serious injuries when a special-needs student got into a golf cart at a local middle school and took off, plowing into a group of teenagers.

The 13-year-old student ran into the youths Monday at Granite Ridge Intermediate in Fresno before hitting a tree.

He and nine other students were taken to the hospital, but only two of the injuries were considered serious — one was a broken leg, the other was back and neck injuries.

Lt. Joe Gomez tells KFSN-TV the teen likely wasn’t familiar with driving and only traveled a short distance.

Police say the golf cart didn’t require a key to work. District spokeswoman Kelly Avants says school officials plan to examine the cart to see whether it malfunctioned.