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25 May 2011, 10:08 | Updated: 25 May 2011, 12:33
Police investigating the deaths of a family of four say they've had some 'promising calls' after the case was featured on a national TV programme.
Northamptonshire Police are searching for businessman Anxiang Du, 52, (right) who is the main suspect following the deaths of university lecturer Jifeng Ding, his wife Helen and their two daughters, Alice and Xing.
All four were found stabbed to death at their home in Wootton, Northampton, on Sunday 1 May 2011. It's thought they were killed on Friday 29 April - the day of the royal wedding.
It is thought Du may have travelled to London in a Vauxhall Corsa that went missing from the Ding family home and was later found in a side street in St John's Wood in the capital.
The 52 year old's face was shown on the 'Most Wanted' board on the TV programme Crimewatch on Tuesday 24 May. Police are hoping someone watching the programme will have seen Du in recent days.
He is known to have arrived in Venables Street, London, at 2.27am on Saturday 30 April. At that time he was wearing a brown coat, white cap and carrying a yellow rucksack.
The force spokeswoman said potential sightings of Du continue to be received by the incident team but none have yet proved to be confirmed sightings of him.
Detective Superintendent Glyn Timmins from Northamptonshire Police said: "I'd ask the public to contact us with information, however limited they feel it is, which can tell us where Anxiang Du is, where he has been or anything to do with the circumstances leading up to this terrible crime.
"It sometimes only takes a small piece of information to significantly move an investigation forward and I am very hopeful that Crimewatch can prompt someone who knows where Anxiang Du is to contact us.''
Crimestoppers has put up a £10,000 reward to find the person responsible for murdering the family. Only information given through Crimestoppers will be eligible for reward.
Anyone with information is asked to call Northamptonshire Police on 03000 111 222 or call Crimestoppers anonymously on 0800 555 111.