Two workers were killed due to an ‍outburst of methane and rock masses at the ‍Pniowek coal mine in southern Poland, owner JSW said on Monday evening.The company said that after 5 pm (1600 GMT) on Monday, a large ⁠amount of methane was released at the Pniowek mine, where a high-performance road header was operating with ten workers underground.For all the latest headlines, follow our Google News channel online or via the app.Eight managed to evacuate on their own, while contact with two others was lost, JSW said. After a ‍seven-hour rescue operation, teams located the missing miners who were pronounced dead ‍at ‍the scene by ⁠a doctor, the ‌company said.On Tuesday morning, ⁠Poland’s Prime ‍Minister Donald Tusk offered condolences to the victims’ families ⁠on X, while President Karol Nawrocki said he received the ‌news of the miners’ deaths “with great sorrow.”Polish Press Agency (PAP) said that the deaths were the 14th and 15th fatalities in mining accidents ‍in Poland this year, and