BOGOTA, Colombia (AP) — Colombian authorities said Monday night that aggravated manslaughter charges would be filed against a bus driver over the deaths of 32 children from a fire in the overcrowded vehicle bringing them home from Sunday school.

Luz Estella Duran, mayor of the village of Fundacion where Sunday’s tragedy took place, said witness accounts suggested the driver might have left the small bus running with the children on board when he got out to put gas in its tank from a portable container.