(Unity, NH) - New Hampshire State Police says three teenagers were killed and another is hospitalized after a one-car accident early Sunday morning in Unity. Speed is believed to be a factor in the crash.A car carrying the 4 teens was traveling at a high-rate of speed and went off West Unity Road and struck a tree, splitting the vehicle into two pieces. 18 year old Brittany Bailey of Claremont and two 17 year olds, including the driver, died at the scene of the crash just after 2 am. Another 17 year old is hospitalized with life-threatening injuries.