A car seen outside the Northampton home of family of four stabbed to death there could be a key piece of evidence in the investigation, police say.

Police are hunting for a silver Vauxhall Corsa with registration plate BG60 PMO, which they believe was at the address on Friday 29 April.

The car, reportedly hired by the family while their own was being fixed, is now missing.

Police discovered the bodies of Jifeng Deng, 46, and Helen Chui, 47, and their two childrenn Xing, 18, and Alice, 12 in their house in Simpson Manor, in Wootton on Sunday evening.

All had multiple stab wounds and the police believe the attack was “not random”.

Neighbours raised the alarm after the family had not been seen for several days.

Police have appealed for anyone with information on the car to come forward.

“The car was hired to one of the deceased, but is not at the address and its whereabouts are currently unknown,” police said.

They have warned the public not to approach the car or any driver even though they do not believe there is a wider risk to the public.