POLICE have trawled through 5,000 hours of CCTV, investigated 2,000 sightings and made nine arrests during the year-long hunt to catch the killer of the Ding family from Northamptonshire.
Tomorrow marks the first anniversary of the murders of Jifeng ‘Jeff’ Ding, Helen Chui and their two daughters, Xing, 18, and Alice, 12.
Suspected killer Anxiang Du, 53, of Coventry, was declared the only suspect soon after the discovery of the murders at the family’s home in Wootton.
An increased reward of £25,000 has now been put up for information leading to the arrest and successful conviction of Du.
Detective Chief Insp Tom Davies, who is leading the investigation, said: “We accept that Du had the opportunity to leave the country soon after the murders and someone most likely will have assisted him in doing this, or will be assisting him now.
“It may be that someone has unwittingly assisted him and we need that person to contact us.”
Four people were arrested on suspicion of conspiracy to assist an offender last week.
They were all released on bail pending further inquiries.
Anyone with information about the murders should call Crimestoppers anonymously on 0800 555111 or the police on 101.