QUITO, June 15 (Xinhua) -- At least four people were killed and two others injured in a road crash Monday on a highway in the Ecuadorian province of Bolivar, the ECU 911 integrated security service said.

Photo taken on July 15, 2017 shows the site of a bus accident on the highway linking the capital Quito and the city of La Mana, in Santo Domingo, Ecuador. At least 14 people were killed and 26 injured Friday night in a bus accident on the highway in central Ecuador, local authorities said Saturday. (File photo: Xinhua)

The accident occurred in the morning when a pickup truck plunged into a ravine on the Guanujo-Echeandia highway. The injured received pre-hospital care at the scene before being transported to a medical facility for further evaluation and treatment.

Images released by authorities showed the vehicle severely damaged, while police were investigating the cause of the accident.

Road accidents are among the leading causes of death in Ecuador, mainly due to speeding and driver error