He added that a fire investigation had concluded the blaze was probably caused by accident.

BBC: Appspond Lane blaze: Fire crews still visit

On Monday, WRS said it was investigating the cause of the blaze but it "could have started by accident, perhaps even by a spent firework".

BBC: Power lines to be restored after Appspond Lane fire

"Work by unlicensed welders, multi-layered sub-contracting and poor management all contributed to the blaze, " Luo said two days after the accident.

CNN: Deadly fire highlights China's growth problem