A raging river killed at least 30 people in Bolivia after a torrent swamped a bus and a truck, police said.

Chuquisaca police chief Iver Marquez stated that volunteer rescuers have found 30 bodies so far, and that more people are feared to be missing. Thirteen people managed to reach safety on dry land, the AP agency reported.

Marquez told the state-run news agency ABI on Sunday that police and soldiers joined local citizens in the remote southern areas in order to look for more victims.

Marquez said that the vehicles became were stranded in the muddy waters of the Molle Punku River on Friday night.

Intense hail falling for hours unleashed the torrent, although the river is dry most of the year. There is no bridge where the vehicles were trying to cross.