Investigators said the blast was likely caused by a chemical accident. Surrounding residents were initially warned to stay indoors; however officials said no toxic material was released.
The Industrias Químicas del Óxido de Etileno plant produces the gas ethylene oxide - used to make antifreeze, pesticides and sterilizing agents - and the liquid propylene oxide — used to make plastics — both of which are extremely flammable.
CCTV from businesses miles away captured the moment the factory detonated, sending up a fireball that illuminated the night, and launching the shrapnel on its fatal arc into the unlucky man's apartment
Dozens of firefighters were scrambled, spending all of Tuesday night and Wednesday morning tackling the blaze, and spraying water on the remaining intact vats of the volatile chemicals to keep them cool and prevent further explosions.
Roads and public transport in the surrounding areas were closed as a precaution, and did not reopen until the following day.