What happened

An explosion occurred during maintenance work at an alkylation facility at Panjin Haoye Chemical, an independent refinery and petrochemical producer in Liaoning province. Twelve people were killed, one remained missing, and thirty others were lightly injured; the company shut its entire refining and petrochemical complex afterward. China's Ministry of Emergency Management investigated the cause. This was an accidental industrial explosion, not an attack.

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.