A truck carrying mining explosives exploded after colliding with another vehicle in northern Mexico, killing at least 37 people, including three reporters who arrived on the scene, state and federal officials said. Soldiers, police, emergency officials, nearby residents, and reporters were present Sunday night when the fire broke out and the truck filled with explosives detonated. The blast occurred near the town of Sacramento. Federal police said 37 people were killed and 150 were injured. A state official said three newspaper reporters from the city of Monclova were among the dead.