China ? Rescuers ended efforts today to find more survivors at a northern China coal mine where at least 74 people were killed the day before in underground explosions in the country’s deadliest mine disaster in a year.

Of the more than 300 survivors of the accident at the Tunlan mine, 114 remained in the hospital, five of them in critical condition, said an official with the Shanxi provincial government spokesman’s office, speaking on condition of anonymity, citing policy.

The spokesman said the cause of the blast remains under investigation.

The mine’s manager, chief safety officer and chief engineer have been removed from their posts as part of the investigation, the official Xinhua News Agency reported. Xinhua did not identify the men by name or give other details.

A statement posted on the provincial government Web site said final checks on the mine were being conducted.