(CNN) -- Nine coal miners have died from carbon monoxide poisoning at a mine in central China, state-run media reported Monday.
The deaths occurred at a Dongsheng Mining Co. operation in Yiyang County in Henan Province, the Xinhua news agency reported.
Excessive amounts of carbon monoxide were detected in the mine at 8 p.m. Sunday, when two miners were working underground, according to Xinhua.
The company sent seven others to check the situation, but lost contact with them afterward.
The bodies of the miners were recovered on Monday, Xinhua reported.