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19 May 2011, 12:28 | Updated: 19 May 2011, 12:38
A reward of up to £10,000 is now being offered for help in catching the killer of a family of four found stabbed to death at their home.
The bodies of Jifeng Ding, his wife Helen and their two daughters were found at their home in Wootton, Northampton, on Sunday 1 May 2011. It's thought they were murdered on the royal wedding day, Friday 29 April.
Police are still looking for their main suspect, 52 year old businessman Anxiang Du, who's been missing since the bodies were discovered. Detectives are following up a new possible sighting of him in London, near where the Ding family's hire car was found abandoned.
The reward money's been put up by Crimestoppers, who are offering it to anyone providing information that leads to the arrest and conviction of anyone linked to the murders. You don't have to give your name. Only information given to Crimestoppers will be eligible for the award.
Detective Superintendent Glyn Timmins from Northamptonshire Police said: "We welcome the support of Crimestoppers and are very grateful that they have offered this sum of money. People are motivated by different things and we hope that a financial incentive will encourage someone to tell us when Mr Du is hiding."
It's now emerged CCTV cameras captured an image of a man matching Anxiang Du's description in London on Saturday 30th April, wearing clothes appearing to match those known to be worn by Mr Du the previous day. The sighting is approximately four hours after the confirmed sighting of the Ding family's hire car at a service station in Northampton.
DS Timmins said: "Our objective is to gather sufficient evidence to convict and therefore we also call to people of Wootton and surrounding areas to come forward if they think they saw Mr Du en-route to, or in Wootton village, including those who got on the number 15 bus from Greyfriars to Wootton at 1.30 on Friday 29th April.
"Any information however small could be of great help as we build the picture of what happened that afternoon."
You can call Crimestoppers anonymously on 0800 555 111 or online at crimestoppers-uk.org. Alternatively, you can contact Northamptonshire Police on 03000 111 222.