China's official Xinhua News Agency says 25 people have died and 20 remained trapped underground after a gas leak in a mine in south west Chongqing city.
Xinhua said rescuers are trying to rescue the trapped miners. There were 131 people working at the time of the accident Saturday morning, it said, but 86 escaped.
China's mining industry remains the world's deadliest, despite government promises to improve mining safety.