Three people were killed and four others injured, including three who were seriously injured, in a coal mine blast in southwest China's Guizhou Province, local authorities said Tuesday.
The blast occurred around 5:25 p.m. at the Kaifa coal mine in Jinsha County, when officers from a local police station and coal mine workers were destroying expired explosives, sources with the county government said.
The three who sustained serious injuries have been sent to a local hospital.
An investigation into the cause of the blast is underway.
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