CHONGQING, July 4 (Xinhua) -- One coal miner was rescued and four remained missing Saturday after a gas leak in southwest China's Chongqing Municipality, a local official said.

    The accident occurred at about 6:30 p.m. at Kangjia Mine in Sanhui Township, Hechuan District, when five miners were underground, said Guo Mingyue, a deputy district chief.

    Rescue work continued after one miner was saved.

    The private mine is licensed and has expanded its annual production capacity to 120,000 tonnes from 50,000 tonnes after technological innovation.

    The mine accident is under investigation.