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3 January 2013, 15:27 | Updated: 3 January 2013, 15:33
Police investigating a crash near Wisbech, which left two young sisters dead, want to speak to the driver of a red car.
The vehicle was seen on the A47 heading towards King's Lynn when the crash happened around 6:40pm last Thursday (27 December).
It happened at Walsoken when a black Ford Focus left the road and overturned, coming to rest on its side at the edge of a ditch near the Broad End Road junction.
Sisters Tamzin and Jessica Portor, aged 10 and seven and from Sutton Bridge in Spalding, died as a result of injuries sustained in the collision
Three other people travelling in the car, a 12-year-old boy, 38-year-old man and a 43-year-old woman, all suffered minor injuries.
Officers from the Norfolk Police Serious Collision Investigation Team want to speak with the driver of a red car seen travelling towards King's Lynn around the time of the incident.
Anyone with information is asked to contact senior investigator Steve Matthews on 101.