HOHHOT, July 5 (Xinhua) -- Two people were killed and four others injured when a truck exploded following a collision in north China's Inner Mongolia Autonomous Region on Sunday, according to local authorities.

The accident occurred at 11:27 a.m. on Sunday on a national highway in the region's East Ujimqin Banner. The blast and resulting shockwave were triggered when the truck carrying ammonium nitrate collided with a transport vehicle.

The injured people have been sent to the hospital for treatment. The cause of the accident is under investigation.