Three American college students studying abroad in New Zealand died Saturday when their van swerved off a road. The students were all from Boston University, and five other BU students were injured in the accident. The accident occurred at about 7:30 a.m. New Zealand time. “This is a horrible tragedy,” said BU president Robert A. Brown. “Our prayers go out to the students and their families.” The director of the BU study abroad office said that about 47 students from the school were in a program at the University of Auckland. Early reports said that the students were in a seven-seater minivan that rolled as students traveled to a day of hiking on the Tongariro Crossing.