• Kyodo

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An explosion ripped through a tunnel construction site in Minamiuonuma, Niigata Prefecture, on Thursday, injuring three workers and trapping another four, firefighters said.

The blast occurred around 10:40 a.m. about 1.2 km inside the 2.8-km-long tunnel. No explosives were in use for the construction and the cause of the explosion was unknown.

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