One miner died and 11 were hospitalised after an underground tremor shook a coal mine early on Monday belonging to Polish mining group PGG in Radlin, southern Poland, PGG said, Report informs via Reuters.
The tremor occurred at 0206 GMT around 800 metres (874 yards) below ground, it said in a statement.
"There were 29 of our employees in the threatened area. Eleven of them were taken to hospital. Unfortunately one of our colleagues, one of the miners, died," PGG Acting Chief Executive Officer Bartosz Kepa told a press conference.
The miner was pronounced dead on the spot while four of those hospitalised were in serious condition, the head of emergency medical services in Katowice, Lukasz Pach, said at the press conference.
An operation to secure the affected area was still underway and material damage at the mine had yet to be assessed, said Marek Skuza, PGG's Deputy Chief Executive for Production.