The Chinese Government has ordered the evacuation of residents within a 3 kilometre radius of the Tianjin blast site over fears of chemical contamination.
Officials said that the evacuation was prompted by the threat of “toxic substances” spreading.
Anti-chemical warfare troops have now entered into the site.
Officials had until then, only confirmed the presence of calcium carbide, potassium nitrate and sodium nitrate.
Officials have so far insisted that air and water quality levels are safe.
The Chinese Government has ordered officials to make nationwide checks on dangerous chemicals and explosives and to “crack down unwaveringly on illegal activities to ensure safety”.
85 people are now confirmed to have died and hundreds were injured in the giant blasts which occurred in the north-eastern Chinese port on Wednesday.
