The hijacked car which hit and killed a Tyneside grandmother belonged to the dead woman's sister, it has emerged.
The car ploughed into the family group of pedestrians
Pamela Phinn was hit in Horsley Hill Road, South Shields. Her two grandchildren and a 29-year-old woman were also injured.
The Honda Civic was being tailed by a marked police car after a woman reported she had been forced out of it by a man armed with a screwdriver.
Police are questioning a 47-year-old man arrested at the crash scene.
The Independent Police Complaints Commission (IPCC) is investigating the crash, and the Durham force has been appointed to help the inquiry.
Following the carjack on Thursday afternoon on Western Approach in South Shields the car collided with two parked vehicles before ploughing into the family group.
Mrs Phinn, who worked in Asda in the town, was thrown into the air and died on the opposite side of the street.
Her son's partner, 29-year-old Kelly Laws, and their children Dean Phinn, 18 months, and Mia Phinn, aged seven months, were all seriously injured.
A spokesman for the IPCC said the children were "progressing reasonably well" and their mother was "poorly but stable".
Northumbria Police said witnesses were still being sought - particularly to the original incident outside DJ Tool Hire on Western Approach.