A fourth person who was arrested yesterday in connection with the Ding family murder investigation has been released on bail.
Officers are investigating the deaths of four members of the Ding family in Wootton, Northamptonshire, last year.
A 22-year-old woman from Southend, Essex, has been arrested on suspicion of conspiracy to assist an offender.
She was interviewed at a local police station to where she was arrested and later released on police bail.
Three people arrested in connection with the deaths of the Ding family in Northamptonshire last year have been released on bail.
Jifeng Ding, his wife Helen Chui and their children Alice and Xing were all stabbed to death on the day of the Royal Wedding.
Two women and a man who were arrested on suspicion of conspiracy to assist an offender have since been released.
Three people have been arrested today in connection with the investigation into the deaths of a family of four in Wootton, Northamptonshire.
Jifeng Ding, who was 46, Helen Chui, who was 47, and their daughters Xing, aged 18, and Alice, aged 12, were murdered at their home in April last year.
A 54-year-old woman was arrested in Coventry, a 39-year-old woman was arrested in Gloucestershire and a 25-year-old man was arrested in London.
All three have been arrested on suspicion of conspiracy to assist an offender in connection with Operation Nene.
All three will be interviewed in local police stations to where they were arrested.
The arrests were made as part of a joint operation involving the local forces and the East Midlands Special Operations Unit Major Crime team.