Witnesses in the Mexican resort of Acapulco say a band of gunmen chased passengers off a bus and then killed the driver and his 14-year-old assistant. The attackers set the bus on fire and fled.

Police are investigating but have not released any information.

People at the scene say gunmen intercepted the bus around noon Wednesday. They say the gunmen ordered screaming passengers to get off and shot the driver and his young assistant who collected fares. The gunmen left after pouring gasoline in the bus and setting it afire, burning the two victims.

The bus was traveling on the highway that runs between Acapulco and the resort of Zihuatanejo and was headed to the village of Pie de la Cuesta.