A chimney caved in on workers during construction at a 1200MW thermal power plant in Korba district, killing 41, in September 2009.

The three Chinese engineers have been remanded to judicial custody. It is not yet clear what caused the accident but officials from all companies involved have been detained.

Police have already arrested four officials from two Indian firms in connection with the incident. The chimney was being built by India’s privately-owned Bharat Aluminium Company (Balco) at a power plant in Korba.

The company had hired the China-based Shandong Electric Power Construction Corporation to build the power plant, reports say.

Reports add that the China-based company had subcontracted the chimney construction work to Gannon Dunkerley and Company Limited, an Indian firm.