( CNN ) -- Nine people were killed when a bus plunged over a cliff in southern Mexico on Monday night , officials said . Another 30 people were injured , said Rafael Escobar , an official with the state of Mexico 's health institute . The crash took place in Villa del Carbon . Most of the passengers were pilgrims headed to the Basilica of Guadalupe in Mexico City . Escobar said the bus went over a cliff about 40 meters ( 131 feet ) high .
Most of the passengers were pilgrims headed to Vatican City . The bus passed over a bridge about 40 meters ( 130 feet ) high .