A bus loaded with people on their way to a political rally crashed in Mexico Sunday, killing 25 of them and injuring more than 20 others, authorities said. Notimex reported the bus plunged nearly a thousand feet down a ravine in Guerrero state early Sunday afternoon. The bus was headed to a rally in Buena Vista de Cuellar, the news agency said. CNN reported the bus\' brakes apparently failed while traversing a steep incline.