Officials said the blast was probably caused by methane gas.
Death toll in the country's worst mining disaster in three decades, is 23.
Ruda Slaska lies about 300 kilometres south-west of the capital Warsaw.
ZAGREB, Nov 24 (Hina) - Croatian President Stjepan Mesic has sent a letter to his Polish counterpart Lech Kaczynski, offering his condolences on a tragic accident that took place at the Helemba coal mine in Ruda Slaska, southern
Poland, on Tuesday afternoon, the Croatian President's Office said in a statement on Friday.
ZAGREB, Nov 24 (Hina) - Croatian President Stjepan Mesic has sent
a letter to his Polish counterpart Lech Kaczynski, offering his condolences on
a tragic accident that took place at the Helemba coal mine in Ruda Slaska,
southern Poland, on Tuesday afternoon, the Croatian President's Office said in
a statement on Friday.