(AP) — A passenger’s cellphone automatically alerted responders after a car hit a tree early Sunday in a Nebraska crash that killed all six of its young occupants, authorities said.Five men in the Honda Accord died at the scene of the crash around 2:15 a.m. in Lincoln, about 3 miles east of the state Capitol, police said.Police said the cause of the crash remains under investigation, and they said the crash was reported by an iPhone that detected the impact and called responders automatically when the phone’s owner didn’t respond.“We’ve been trying to think of another accident this bad and we haven’t come up with anything.”Investigators hadn’t been able to find any witnesses to the crash by Sunday afternoon, which could make it harder to determine what happened.“We are looking at all possibilities, including alcohol, speed or distracted driving.”"