The bus, carrying more than 20 teens and their chaperones home from a weekend church retreat, came around a sharp curve and hit an SUV head-on. Rescuers had to cut the bus open to extract the injured.A bus carrying teenagers and their chaperones home from a weekend religious retreat collided with another vehicle on a treacherous mountain road and careened down a steep, snow-covered embankment Monday in an accident that killed one and left at least 10 others seriously injured.