The Augsburger Allgemeine newspaper said the explosion occurred at the offices of the German Red Cross around 0500 GMT on Friday, adding that police evacuated the area and that five people were injured, but most of them only slightly.
He crawled from his bed to his parents' room to wake them up from sleep after hearing an alarm from the basement of the house.
The blast happened at about 9 am (0100 GMT) in a crowded neighbourhood, according to a statement by the public security bureau in the city's Doumen district.
Police Commissioner R.K. Meena said one person died as he fell into a village well while running away from the plant and another person died after he jumped from the second storey of his house to escape. The others died in a hospital.
Five people died after a three-story building in the southern Polish ski resort of Szczyrk collapsed on Wednesday following a gas explosion, local authorities said on Thursday.
The tank blew up around midnight, with Fars news agency saying "a number of social media users reported seeing an orange light" in the east of the Iranian capital.
Fourteen miners were killed on Tuesday in a coal and gas blast at a mine in southwest China, leaving two people still trapped underground, authorities said.
The tanker carrying liquefied petroleum gas exploded at a highway exit in Taizhou in Zhejiang province on Saturday afternoon, an earlier report said. The blast sent flames and a cloud of smoke high into the sky, state-media pictures showed.
The authority responsible for dealing with disasters said 70 homes were damaged and firefighting was still going on, although 15 hours had passed since the blast in Samut Prakan province. The cause of the explosion is not yet known.