A bus in the Peruvian Andes reportedly transporting workers at MMG Ltd’s Las Bambas copper mine plunged off a cliff on Friday, killing at least 15, injuring 3, local media reported, citing police sources, Reuters reported.

The accident happened in the Cotabambas province in Peru’s Apurimac region, according to Peruvian radio RPP.

MMG did not immediately respond to a request for comment.

RPP reported that the bus fell some 200 meters (656 feet).