But the People's Daily newspaper reports the government has said it did not order any evacuation. (Video via Voice of America)

One of the suspected chemicals is sodium cyanide, which can be lethal if inhaled or ingested. (Video via CCTV)

New explosions have since gone off at the site of the main explosion, though their cause is unclear. (Video via BBC)

This video includes music from Chris Zabriskie / CC BY 4.0.