Several officials from the company operating the Turkish mine which blew up last week killing more than 300 workers, have been charged by prosecutors.
They include the Soma mine’s general manager, and the son of the plant’s owner.
A technician from the mine was also arrested in western Turkey, as investigators said officials had ignored high levels of toxic gas and a rise in temperature inside the mine hours before the accident.
Eight others have reportedly been charged but have been freed on probation pending bail.
Prosecutors say it was an hour before the alarm was raised.
The accident in the privatised mine was the worst of its kind in Turkey’s history and has sparked huge criticism over working conditions and safety standards.