The driver of the vehicle that was carrying the band La Reyna de Monterrey dozed off Saturday morning, causing the vehicle to strike the side of a truck, then cross over into the other lane and crash head on with a tractor-trailer, according to a police official who spoke on condition of anonymity for security reasons.
The official said the force of the collision was so powerful that some of the band members were thrown from the vehicle onto the highway connecting the U.S.-Mexico border town of Nuevo Laredo and Monterrey, which is just to the south.
La Reyna de Monterrey played the musical genre known as Banda music. It had played in a bar in Nuevo Laredo the night before.
The Associated Press contributed to this report.