Police have made a further arrest in connection with the investigation into the deaths of four members of the Ding family in Northamptonshire last year.
A 22-year-old woman from Southend, Essex, was arrested this afternoon in Plumstead, London, on suspicion of conspiracy to assist an offender.
Three people who were arrested yesterday also on suspicion of conspiracy to assist an offender have been released on police bail.
Police investigating the murder of a family of four killed in their home in Northamptonshire are renewing their appeal to find the killer.
A close friend of a family stabbed to death in their home has criticised detectives saying more should have been done to catch their killer.