The flooding was caused by construction work at the Osinnikovskaya coal mine while 143 miners were in the underground mine late Tuesday, local authorities said in a statement.
Rescuers reached 139 miners, three of whom had minor injuries, RIA Novosti reported. Whether the missing four miners were injured was unknown.
Kemerovo Region Gov. Aman Tuleyev has set a three-day deadline for local mining companies to conduct safety checks in response to the incident, the statement read.
The mine is owned by EvrazHolding, RIA Novosti reported.
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