Girls killed in Wisbech A47 ditch crash were sisters 28 December 2012 Last updated at 11:48 Two girls who died after a car crashed into a drainage ditch on the A47 in Norfolk on Thursday were sisters. The youngsters, aged seven and 10, died in hospital from serious head injuries after the incident near Wisbech. Their father, 12-year-old brother, and another adult suffered minor injuries when the Ford Focus they were in rolled onto its side. The five people travelling in the car were all taken to the Queen Elizabeth Hospital in King's Lynn. Ch Insp Chris Spinks appealed for witnesses to come forward. He said: "Fatal collisions are tragic in any circumstances but given the fact that two young lives have been lost at this time of year seems to make it that much worse. Specially trained family liaison officers are supporting the bereaved relatives and collision investigation officers are piecing together the events that led to the crash. The circumstances are still unclear at this stage and I would ask anyone who thinks they might have information to come forward. Police would like to hear from anyone who may have witnessed the incident or saw the car being driven before the crash.