**Twelve miners have been killed in a methane gas explosion at a coal mine in Ruda Slaska-Kochlowice, southern Poland, officials say.**The blast struck the Wujek-Slask mine on Friday morning, a spokeswoman for Poland’s mines authority, Edyta Tomaszewska, told reporters.
She said 30 miners were taken to hospital. The blast occurred 1,050m (nearly 3,500ft) underground.
A blast at another pit in Ruda Slaska killed 23 miners in November 2006.