This is a lesson that we should all learn about welding safety. Such fire in not uncommon when structures are being build or rehabilitated. All aspiring safety person should learn from such tragedy.
Combustible fabric around the structure. Probably lack of control with welding sparks since it appears that chinese welders are being detained. I suspect that the punishment will be execution as was the case with the tainted milk scandal.
I saw a program with the crane operators replacing an obsolete TV tower from the top of an office building in San Antonio near the Alamo. The show was all about the riggers. However welders started a fire on top the building during the filming. It aint just China if it happens here too.
I agree. We have ALL this rules and laws to govern safety - both governmental and coporate. Most times when I investigate an accident - there is usually a blatant disregard for a well know rule.