New CCTV images of Northampton murder suspect
Police investigating the Ding family murders in Northampton have released new CCTV images of suspect Anxiang Du.
Jifeng Ding, his wife Helen and their two daughters were found stabbed to death at their Wootton home in April.
The CCTV images show Mr Du, 52, from Coventry, at Northampton Bus Station at 1250 BST on the day of the murder.
On Friday it was revealed that a 999 call believed to have been made as the family was being murdered was being investigated by the police watchdog.
Northamptonshire Police said it had referred the response to an abandoned 999 call on 29 April to the Independent Police Complaints Commission.
Police believe Mr Ding, a lecturer at Manchester Metropolitan University, his wife and the children, Alice, 12, and Xing, 18, were killed on 29 April. Their bodies were found two days later.
Northamptonshire Police has also released pictures of Mr Du at Coventry Railway station at 1000 BST and at Birmingham New Street at 1050 BST on 29 April.
Det Supt Glyn Timmins has repeated his appeal to anyone who saw Mr Du travelling to Wootton on Friday 29 April to come forward
"Any information however small could be of great help as we build the picture of what happened that afternoon," he said.
Mr Du, who had business dealings with the Ding family, disappeared from his Coventry home on 29 April.
The investigation moved to London last week when the missing family's Vauxhall Corsa hire car was found in St John's Wood.
Crimestoppers has put up a £10,000 reward to find the person responsible for murdering the family.
The case is due to be featured on BBC Crimewatch on 24 May.