Colombia ? An explosion tore through a makeshift coal mine in remote northeast Colombia on Saturday, killing 32 miners, a civil defense official said.

Rescue crews had located the bodies buried more than 1,300 feet below ground but were unable to safely remove them, said Yesid Arias, who was helping to coordinate the operation.

Officials had previously reported that three miners were dead and 28 were missing at the mine in the remote hamlet of San Roque, 255 miles northeast of Bogota.

“We have orders to work through the night and recover the bodies as quickly as possible, but unfortunately there’s still plenty of trapped methane gas that’s making it unsafe for work crews to stay underground for any extended period of time,” Arias said.

The morning explosion was caused by “some spark and the gas that was inside” the mine, said Fernando Rosales, director of civil defense in Norte de Santander state.

Many mines in this Andean nation are makeshift affairs with few or no safety procedures.