Three mining technicians have been rescued, while 22 others remain missing after a gold mine collapse in Tanzania’s Shinyanga region, Xinhua said on Tuesday.

The accident occurred on Monday during maintenance work at the Wachapakazi Gold Mine. District Commissioner Julius Mtatiro said rescue teams, led by defense and security forces, are working to locate those still trapped.

Authorities said the mine had previously been ordered to suspend operations following safety inspections, according to Xinhua.