After five months of investigations, the team has concluded that the disaster was caused by ignition of hazardous materials, improperly or illegally stored at the site, Xinhua news agency reported.
The fire first started in a container through auto-ignition of nitro-cotton due to vaporisation of the wetting agent during hot weather. The fire spread, igniting other chemicals, including ammonium nitrate.
Authorities are continuing the clean-up nearly six months after the explosions. (IANS)