ANDOVER, Mass. (AP) — Massachusetts State Police say a school bus with more than 50 people on board has been involved in a crash with a tractor-trailer.

Police say the crash occurred Tuesday morning on Interstate 495 north in Andover near the Interstate 93 ramps.

The bus had 42 students and nine adults on board.

Police did not say how many people were injured or where the students were from.

The vehicles had been moved off the road.

No other information was available.