What happened

A flash explosion occurred while contractors were dismantling internal floating components during maintenance inside a benzene storage tank, killing six people. China’s Ministry of Emergency Management said accumulated benzene escaped from leaking float compartments, formed an explosive atmosphere in the poorly ventilated tank, and was probably ignited by non-explosion-proof tools or work activity.

When cited sources give different casualty, damage or spill figures for this event, they’re reported side by side above rather than merged into one number. See how confidence levels work.