Authorities are investigating the cause of the explosion, which Saad al-Kaabi said was "an accident and not sabotage or hostile in nature", despite earlier Iranian attacks targeting energy facilities in the Gulf during the Middle East war.He announced "the tragic loss of 13 lives of our people who hold Indian and Pakistani nationalities. 66 people have been reported injured and are receiving medical treatment, none of whom are in life-threatening condition".The interior ministry had said a "technical incident" caused the explosion late on Sunday in the Gulf emirate's Ras Laffan industrial zone.The blast took place at a unit supplying gas to local firms and reverberated across the capital Doha. "It will not affect anything regarding export. It will not affect anything regarding our local requirements," Kaabi said, adding that the explosion had "no environmental impact".At the time of the explosion, AFP journalists in the Qatari capital heard the blast on the country's northern coast, 64 kilometres (40 miles) away. Another, 20 kilometres away, saw bright orange flames and a plume of smoke rising from the area, home to the world's largest liquefied natural gas hub.'Internal explosion'Qatar's state-owned energy company said the blast erupted "during the start-up of operations at Ras Laffan Industrial City, which resulted in an explosion and fire at Barzan local gas supply facility".