QUITO, Ecuador — Ten people died on Sunday when the truck they were traveling in fell into a ravine in the Ecuadorian Amazon, law enforcement authorities in the South American country said.

Police in the Amazon province of Morona Santiago, in the country’s southeast, said the only survivor of the accident was a 3-year-old girl. Authorities did not immediately reveal the cause of the crash.

Ecuador’s Integrated Security Service said in a statement that the vehicle stopped near the Paute River after falling into a ravine early Sunday morning. Photos released by the agency show the vehicle upside down surrounded by rocks on the river bank.

Roads in Ecuador were congested throughout the weekend due to a five-day Day of the Dead celebration.