XI’AN, 7th January 2016 (WAM) — All 11 trapped miners have been confirmed dead after a coal mine collapsed in northwest China’s Shaanxi Province Wednesday, local authorities said Thursday afternoon.

The collapse occurred in a pit at Liujiamao Coal Mine in Shenmu County of Yulin City around 9 a.m. Wednesday. Among 49 miners working underground, 38 managed to escape while 11 were trapped, the county government said as reported by state-run news agency, Xinhua.

One miner was found at 7:10 a.m on Thursday when the rescue team went as far as 1,400 meters from the pithead. Another one was carried out two hours later, but all of them were confirmed dead.

As of 1:30 p.m., bodies of the remaining nine people trapped in the coal mine have been all recovered.

The accident was caused by the collapse of the void left behind after coal is removed, according to a preliminary investigation report.

An investigation into the cause of the collapse is still under way.