MEXICO CITY: At least 17 people were killed and 31 got injured when a bus carrying a church group plunged into a deep ravine in the southern Mexican state of Chiapas on Sunday, authorities said. According to the local office of Interior Ministry´s civil protection department, the bus fell into a 90-meter (300-foot) gorge in the Motozintla region near the border with Guatemala. The bus was carrying members of the Seventh-day Adventist Church returning from a retreat in the Pacific coast town of Pijijiapan, local police said. An apparent mechanical failure caused the accident, according to federal highway police involved in the rescue effort.