The Peruvian Attorney General's Office confirmed Thursday that the death toll when a bus plunged into a river in the central jungle has risen to 35.

The district attorney in the city of Chanchamayo, Ernesto Sierra, told Canal N television that 23 of the bodies have been identified and the search is continuing for the four people who are still missing.

Sierra said that some of the bodies recovered were found in the river near the spot where the bus belonging to Turismo Central went off the road on Wednesday and slid down an embankment into the water.

On the day of the accident, 15 injured passengers were rescued and taken to various hospitals, where they are being treated.

The bus was en route from Lima to the jungle city of Satipo, in the central Junin region, but it went off the road just before entering a tunnel and slid down an embankment some 80 meters (260 feet) high into the Tarma River some 370 kilometers (229 miles) from Lima for reasons that are still under investigation.

Bus accidents - some of which result in dozens of dead and injured - are relatively commonplace in Peru's interior, where the geography, the poor state of roadways and vehicles, as well as driver imprudence or error can all be contributing factors.

Peruvian police said that 473 people have been killed in road accidents so far this year nationwide. EFE