HOUSTON --Houston police are investigating an accident involving an off-duty sergeant and a school bus in southeast Houston. The off-duty officer was in his personal vehicle on his way into work when he collided with a private school bus at the intersection of Harrisburg and 79th Street, police said. The officer was transported to Memorial Hermann Hospital with non-life-threatening injuries. It wasn't immediately clear whether anyone aside from the driver was aboard the bus. An investigation is ongoing. Stay with Eyewitness News and abc13.com for the latest details.