Three people have been arrested by police investigating the murders of four family members.
Jifeng Ding, his wife Helen Chui and their daughters, Alice, 12, and Xing, 18, were found stabbed to death at their home in Wootton, Northamptonshire on 1 May last year.
A 54-year-old woman was arrested in Coventry, another woman, 39, was held in Gloucestershire and a 25-year-old man was detained in London. They are being held on suspicion of conspiracy to assist an offender. A businessman, Anxiang Du, who has not been traced, has been named as the main suspect.