PIEDRAS NEGRAS, Mexico (AP) - A truck carrying explosives for the mining industry exploded after running into another vehicle in northern Mexico, killing at least 37 people, a federal police official said Monday.

The two cars collided Sunday evening on a highway in Coahuila state, near the town of Sacramento, Luis Horacio de Hoyos said.

Soldiers, police, emergency officials, nearby residents and reporters were on the scene when the vehicle suddenly caught fire, igniting the truck full of explosives.

Maximo Alberto Neri Lopez, a federal police official, said 37 people were killed and 150 were injured. He said the explosion left a 3-meter by 15-meter crater in the concrete.

De Hoyos said three newspaper reporters from the city of Monclova were among the dead.