Seven people have been arrested in connection with a gas explosion in a Chinese coal mine which killed 91 people, state media has reported.
Seventeen miners are still missing
Those detained include investors and senior officials of the privately-run colliery, Xinhua news agency said.
Seventeen miners are still missing, four days after the blast in Tangshan, northern Hebei province.
It was the third fatal accident to hit China's mining industry, one of the most dangerous in the world.
The explosion occurred on Wednesday at the Liuguantun mine near Tangshan City, 165km (100 miles) from Beijing.
There were more than 6,000 deaths in China's coal mines last year.
Beijing is struggling to clean up the mining sector, announcing repeated safety campaigns.
However, the booming economy has pushed up coal prices, putting mines under pressure to step up production, and mines often operate illegally.