The death toll from an explosion at a fireworks factory in North China's Inner Mongolia Autonomous Region has risen to five...The blast ripped through the privately-owned Baoxing Fireworks Factory in Aohan banner of Chifeng city...Initial investigations have attributed the blame to worker Teng Jicun...for triggering the fire with a welding device which was forbidden...Shareholder Zheng Guangyi and Ren Yuexin...have been detained. Police are hunting for another shareholder Zheng Guolian and the factory's bank accounts have been frozen.