Authorities in northwestern Mexico said that at least 10 people, including eight adults and two children, were killed and 26 others injured when a bus, carrying 40 passengers, went off a mountain road and crashed down about 45 meters (about 150 feet) into a ravine.
Civil Protection Director Alonso Gomez, in the Durango state town of Gomez Palacio, reported that the accident occurred on Saturday as the bus headed back to his town after a tourist outing.
Gomez said on Sunday that the driver reported the brakes failed and he lost control of the bus. The driver is also injured and in custody while the accident is investigated.
The road where the accident happened is narrow and winds through canyons up to 300 meters (nearly 1,000 feet) deep.