The driver and a companion suffered injuries Monday when a fumigation tanker exploded on the Autopista General Cañas in Heredia.
The Cuerpo de Bomberos said the explosion was caused by a buildup of gas in the rear of the vehicle.
The fire agency responded to the 10:24 a.m. emergency. The agency said that the vehicle was transporting 12 kilos of waste Aluminum phosphide. The chemical oxidized and released gas that built up and exploded, the agency added. The material is used for fumigation of silos and grain storage bins.
The two men in the Orkin vehicle suffered respiratory problems and bruises, said firemen. There was no blaze although the material has the potential to ignite, said firemen.