(CNN) A methane gas explosion in a coal mine in the northeast of the Czech Republic has killed 13 miners, the mining company said on Friday.

OKD, the company that operates the CSM mine near the city of Karvina, said 11 of those killed were Polish miners provided by a contractor agency, while two were Czech.

"Due to yesterday's mine disaster, 13 miners lost their lives -- 11 Poles and two Czechs," OKD spokesman Ivo Celechovsky said in a televised statement.

A further 10 miners were injured in the blast, with one in a critical condition, the Czech national news agency CTK reported.

The OKD mining company confirmed that 13 people died in the explosion.

OKD's managing director, Boleslav Kowalczyk, said search and rescue operations had to be called off because of poor conditions in the mine.

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