DURANGO, Mexico, Aug 17, 2012  - Eleven people were killed and 23 others injured Friday when a bus headed to the Pacific resort town of Mazatlan fell into a mountain ravine, local officials said.

The bus “was carrying seniors going from Tlaxcala to Mazatlan, on the Pacific coast, for a Christian convention,” said Durango state civil defense official Arturo Galindo.

It plummeted about 165 feet (50 meters) into a ravine in the Sierra Madre. The driver and his assistant died on impact.

The incident occurred less than a month after the deaths of 26 people in another bus accident.

President Felipe Calderon said earlier this week that traffic accidents cause the deaths of some 16,000 people annually, making Mexico’s roads the seventh most deadly in the world.