Just after 3:00 p.m. authorities responded to Tate Road in Corinth for reports of a truck hitting a school bus.
Staff Sergeant William Sheehan with the Penobscot County Sheriff's Office said a full sized pickup truck rear-ended the school bus as it was getting ready to let children off. He said "It appears the truck did not brake, did not stop when it hit the school bus, it was a very hard hit to the back of the bus."
The driver of the truck was sent to the hospital with serious injuries.
There were only three children on the bus at the time of the accident and sheriffs said all the kids are okay.
Officials have not yet released the same of the truck driver.
The cause of the accident is still under investigation.