The public prosecutor in LIMA reported that at least 13 people had been killed in a collision between a bus and a motorcycle taxi on Sunday.
Prosecutor Edwin Ramos told RPP radio station that the fire that broke out after the head-on collision was responsible for the deaths. Ancash is located about 370 kilometers (230 miles) north of Lima.
In Casma province, police said fingerprints would be used to identify the dead because the bodies were too badly burned for identification.
A motorbike taxi driver was killed, and the bus driver was detained by police.
In addition, six people were hurt and taken to the Casma area hospital.
The bus had about 50 people on board, all of whom were headed south from Piura in northern Peru.
Road accidents are common in Peru due to factors such as high speeds, deteriorating roads, a lack of signs, and lax enforcement.