Up to 130 firefighters are fighting a massive blaze in the wake of a huge explosion at a factory on China's mid-east coast earlier today. The explosion, which was caught on several cameras, reportedly happened at a petrochemical plant in the city of Rizhao, in Shandong province, according to local media.There are reports that fire crews from neighbouring Qingdao City have rushed to help battle the towering blaze. It is unclear at this stage whether anyone was injured in the blast. Early reports indicate that a tank storing combustible materials exploded.