 early yesterday on I-15 in Box Elder County. Utah Highway Patrol says the collision happened at about 3.20 a.m. near mile marker 360 in Perry. The driver of an SUV braked and was rear-ended by another vehicle. The SUV went off the highway and rolled over. Troopers say two occupants in the SUV were not wearing seatbelts and were ejected. Both were taken to an area hospital with life-threatening injuries. A third person in the SUV refused treatment at the scene. The collision is under investigation.