Japan police investigate cause of blast that hurt 42

Japanese police were investigating Monday the cause of a powerful blast that ripped through a restaurant in the country's north overnight, injuring 42 people and damaging surrounding buildings. The explosion in the city of Sapporo on Sunday night started fires and caused the partial collapse of some neighbouring buildings, forcing dozens of residents into shelters, officials said. Numerous customers at the restaurant on the building's first floor said they smelled gas at the time of the explosion, Kyodo News agency reported.

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