China has also ordered a nationwide check on dangerous chemicals and explosives.

In a report, Xinhua said the cabinet, the State Council, had ordered "governments at all levels to reinforce the safety management".

They should "firmly implement special regulatory measures for highly toxic chemicals such as cyanide, as well as inflammable and explosive materials"reneex.
Is it safe?

Reuters reported that, according to a 2014 government assessment, the Ruihai facility was designed to store chemicals including butanone, an explosive industrial solvent, sodium cyanide and compressed natural gas.

The company also reportedly handles toluene diisocyanate, which is used in the production of flexible polyurethane foams.

Officials have confirmed that calcium carbide, potassium nitrate, ammonium nitrate and sodium nitrate were at thereenex cps warehouse.

Police have also confirmed that sodium cyanide was present near the site. It is soluble in water and, when dissolved or burned, it releases the highly poisonous gas hydrogen cyanide.

You can read more about the toxic chemicals believed to be at the site here.

Xinhua said on Thursday that drains from Tianjin to the Bohai sea - a gulf in the Yellow Sea - had been closed "to stem a chemical leak"reenex cps .