At least 14 people died Monday on a highway in the northeastern Brazilian state of Bahia when their bus collided with a tractor that was positioned crosswise in the road after having fallen off the truck transporting it, authorities said.

The accident occurred at 6:10 a.m. on federal highway BR-110 in the vicinity of Alagoinhas, a city 120 kilometers (74 miles) from Salvador, the capital of Bahia, the Federal Highway Police reported.

Twelve people were pronounced dead at the scene and two others died at a hospital in Alagoinhas.

Police said that an undetermined number of passengers were injured and were taken in three ambulances to hospitals in Alagoinhas, but they provided no further details.

The tractor was being transported on a wagon pulled by a truck, but it fell into the roadway and wound up blocking the way on a curve and was not visible to vehicles in the opposing lane, police said.

The driver of the bus, which was transporting 38 passengers, managed to avoid a head-on collision but sideswiped the tractor and a sizable portion of the bus's side paneling tore loose and got tangled in it.

The bus had departed from Sao Paulo, Brazil's largest city, and was en route to Paulo Afonso, Bahia. EFE