Five people died and another 25 were injured Friday when a bus and truck collided on the international route connecting Chile with Argentina through the Los Libertadores mountain pass in the Andes, authorities said.

One person remained unaccounted for after the accident, which took place at 7:30 a.m. on the highway linking Los Andes, Chile, with the Argentine city of Mendoza.

A truck with an Argentine license plate and loaded with wheat apparently had a brake failure and crashed head-on into a bus full of workers from the Chilean construction company SalfaCorp, Chilean police Capt. Cristian Becerra told the news Web site Emol.

Three of the fatalities were workers from the firm while the other two were the bus and truck drivers.

Police believe that one person is still missing, since there were originally 29 workers on the bus and up to now only 28 have been found.

The highway, which at this time of year has more traffic than usual as a result of the Christmas and Southern Hemisphere summer vacation seasons, is the main border gateway between Chile and Argentina. EFE