The four people injured in a four-car crash Thursday afternoon accident in Plaistow, N.H., included a Haverhill woman, a Plaistow man and two from Sandown. State Police said Marechal was trapped in the overturned Mercedes and freed by members of the Plaistow Fire Department and flown by medical helicopter to Massachusetts General Hospital for treatment of serious, but non-life-threatening injuries. Vadeboncoeur and Smith were taken to Plaistow Emergency Room for treatment of minor injuries, while Smith’s passenger, a minor, was also flown by medical helicopter to Massachusetts General Hospital for treatment of serious but non-life-threatening injuries. A statement, reportedly on behalf of Marechal, received by WHAV Saturday said the Haverhill woman suffered a medical emergency prior to the crash. Troopers were assisted by the Plaistow police and fire departments; Plaistow Community Emergency Response Team; Haverhill, Atkinson and Newton Fire Departments; Boston MedFlight, Lawrence General Hospital Emergency Medical Services; and Plaistow Highway Department.