Authorities are trying to determine why a pickup truck crossed into the opposite lane on a darkened, two-lane West Texas highway before colliding head-on with a van, killing nine people including six New Mexico university students and a golf coach, as well as a 13-year-old boy. The University of the Southwest students, including one from Portugal and one from Mexico, and the coach were returning from a golf tournament. Also killed in Tuesday evening’s fiery crash were the pickup truck's driver, while two Canadian students were hospitalized in critical condition.