Big-badda-boom
Story thus far is that the area of the port facility held volatile materials and something went horribly wrong.
ALSO: A single company (state sanctioned to handle the dangerous stuff) is responsible for the area where the blast took place.
ALSO: ALSO: The inevitable "the company cut corners and/or bribed those responsible for keeping tabs on the safety issues". I took that with a grain of salt until I recalled the Texas explosion a few years back in which the involved company had somehow not been inspected for YEARS.
EDIT: To add second link
Edited, Aug 13th 2015 10:21pm by Bijou