Ten trapped after second Chinese mine explosion

An explosion has killed at least 17 workers at a coal mine in northern China and 10 others remain trapped.
There were 136 people working underground when the blast occurred at the Baoma Mining Company mine in the city of Chifeng, Inner Mongolia on Saturday, Xinhua news agency reports.
It says 109 miners managed to escape.
The accident comes four days after a fire killed 21 people and left one miner missing at an unlicensed coal mine in the city of Qitaihe in northeastern China.
The Qitaihe explosion happened on Tuesday night, with the state-run Xinhua news agency quoting local officials as saying 21 were confirmed dead.
#LATEST: 21 confirmed dead, 1 still trapped in NE China's #Heilongjiang coal mine explosion accident which occured on Nov 29 pic.twitter.com/2ejVO3nqtG
— People's Daily, China (@PDChina) December 3, 2016
Police said the blast was an accident, but the mine was unlicensed. Its owner and manager have been taken into custody.
Hundreds of rescuers were delayed in their efforts to reach the workers due to poisonous gases, according State television CCTV .