At least 100 people are involved in search operations at the world’s largest underground copper mine.

Rescue teams in Chile are searching for five miners trapped after a partial collapse triggered by a tremor killed one colleague and halted operations at the world’s largest underground copper mine.

At least 100 people were involved in the perilous search effort, said Andres Music, general manager of El Teniente mine in Rancagua, some 100km (62 miles) south of Santiago.

“So far, we have not been able to communicate with them. The tunnels are closed, they are collapsed,” he told reporters on Friday.

The miners had been working at a depth of more than 900 metres when the collapse happened. Their exact location has been pinpointed with specialised equipment.