Authorities in Peru say a truck carrying students and teachers home from a parade fell into a ravine in the Andes Mountains, killing 17 people and injuring 33.

Hospital director Rosa Pascual says five of the injured are in "grave condition" following the accident Sunday near the remote community of Cahuac, 263 kilometers (163 miles) northeast of the capital, Lima. Fifteen of the dead were students aged 9 to 15.

Gov. Ruben Alva said Monday that the truck was returning from a flag day parade when it fell 300 meters (985 feet) into the ravine.

School director Yonel Espinoza said the students decided to get in the back of the truck because they wanted to avoid the 90-minute walk from the parade site back to Cahuac, where they lived.