A woman driver who may have seen the fatal crash on the A12 in Martlesham which claimed the life of a toddler last week has been urged to contact police.

A 20-month-old little girl died at Addenbrooke’s Hospital in Cambridge on Friday afternoon after a two-vehicle collision on the A12 southbound in Martlesham, between the Tesco and BT roundabouts, at around 1.45pm on Thursday.

Officers are appealing for the driver of a slate grey 4x4 to come forward.

A Suffolk Constabulary spokesman said: “The driver of the large 4x4 – thought to be a woman, described as white, in her 40s to early 50s with blonde hair – is being sought as a potential witness as this vehicle is thought to have been behind the two cars involved in the crash.

“It is possible the driver may not have initially realised the seriousness of the incident and police are urging her to get in touch.”

If you are the driver police have described, or someone else who may be able to help, call police on 101, quoting CAD number 187 of February 11.