South Africa's president is facing calls to order an inquiry into a police operation that was meant to combat illegal mining but ended up leaving 87 miners to die underground as authorities attempted to force them to surrender during a monthslong standoff.

The death toll in a monthslong standoff between police and miners trapped while working illegally in an abandoned gold mine in South Africa has risen to at least 87, police said Thursday. Authorities faced growing anger and a possible investigation into their initial refusal to help the miners and instead “smoke them out” by cutting

The prospectors were trapped underground for months as police, on orders from South Africa’s government, attempted to starve them out.