Forecast rain could bring further explosions
Greenpeace Asia’s Beijing office said: “We are concerned that certain chemicals will continue to pose a risk to the residents of Tianjin.
“According to the Tianjin Tanggu Environmental Monitoring Station, [the] hazardous chemical toluene diisocyanate (TDI) react[s] violently with water and reactive chemicals, with risk of explosion.
"This will present a challenge for firefighting and, with rain forecast for tomorrow, is a major hazard,” it added.
Tianjin, China - TDI (toluene diisocyanate) and sodium cyanide were stored at the site where explosions have caused the deaths of 44 people.
The first blast was at 11:30pm (GMT 15.30) on Wednesday 12 August and a second blast 30 seconds later.
Shockwaves shattered windows in nearby buildings and hundreds of injured flooded into local hospitals.
A seismic agency under China Earthquake Administration states the first blast was equivalent to three tonnes of TNT energy, the second 21 tonnes. Other smaller blasts were also reported.
The facility is run by Tianjin-based Ruihai Logistics, said a notice by Tianjin's fire department dated 13 August.
Ruihai has warehouses at the site for the storage of hazardous materials including TDI and sodium cyanide, according to an inspection document by local government.