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Police investigating the murder of a Manchester Metropolitan University Lecturer and his family believe a missing car could give more information about the killing.
The family was named locally as college lecturer Jifeng Ding, his wife Helen Chui, and daughters Alice and Xing.
They were attacked at their detached home in the Wootton area of Northampton and were found dead on Sunday.
Police want to trace a silver five -door Vauxhall Corsa, registration BG60 PMO that was hired by one of the family members and was last seen on Friday.
The background of the family is being investigated to try and establish a motive for the attack, which police believe was not random.
A Northamptonshire Police spokesman said: "At this moment in time the motive behind the deaths does not appear to be due to burglary or robbery.
"Local officers are conducting house-to-house inquiries and are liaising with residents and local people to offer reassurance and advice over any safety concerns.
"We do not believe there is any risk to the wider public."