SHIJIAZHUANG -- Two of the six miners trapped early Wednesday in a collapsed coal mine in North China's Hebei province have been rescued, local authorities said Thursday.

At around 10:40 am Thursday, the two miners were brought to the ground with stable vital signs, according to the local government.

Rescuers are racing against time to locate the remaining trapped miners.

The cave-in happened at 4:37 am Wednesday in the Qianjiaying mining subsidiary of Kailuan (Group) Limited Liability Corporation, a major state-owned coal mining company in Hebei.

The Qianjiaying subsidiary is located in Fengnan District in the city of Tangshan.