Seventeen workers have been killed after a methane gas explosion ripped through a coal mine near the town of Dursunbey in north-west Turkey.
The blast caused an underground chamber to collapse, trapping the workers nearly 820ft below the surface.
Some 29 workers have been evacuated from the mine, of which 11 were taken to hospital with severe burns.
In December last year, 19 workers were killed when a coal mine in north-west Bursa province collapsed after dynamite was set off.
A similar blast killed 17 people at the Dursunbey coal mine three years ago.
In Turkey's worst mining disaster, a gas explosion near the Black Sea port of Zonguldak killed 270 people in 1992.