The death toll from the bus accident near Malinalco, a city in central Mexico, has risen to 13, with 41 other people injured, the Mexico state Public Safety Secretariat said.

Five males, including two boys, and eight females died in Saturday's accident, officials in Mexico state, which surrounds the Federal District and forms part of the Mexico City metropolitan area, said.

"Unfortunately, another body was found when the job of removing the cadavers started," the secretariat said in a posting on Twitter.

The accident occurred on a stretch of the highway known as the Curva del Diablo.

The cause of the accident has not been determined, but officials said brake failure may be to blame.

The bus was heading from Aguascalientes to the Christ of Chalma sanctuary, a pilgrimage destination for many Mexican Catholics, when went down a 60-meter (197-foot) ravine.

"My solidarity and support go out to the families from Aguascalientes who suffered an accident on the road to Chalma," Mexico state Gov. Eruviel Avila said in a posting on Twitter.