Detectives investigating the murder of a man found stabbed to death at his Kempston home have made a fifth arrest.
A 17-year old man, from Trinity Road, Bedford, was arrested on Thursday on suspicion of the murder of Serafettin Demirsay, 65, in May.
Mr Demirsay died after being attacked by three men who forced their way into his house in Vineyard Way.
Three men, aged 17, 18 and 19, arrested in July on suspicion of murder remain on bail.
A fourth man, aged 24, arrested the day after the murder, was released from bail without further action.
Police have offered a £10,000 reward for information leading to the arrest and conviction of the offenders.
Turkish-born Mr Demirsay, known locally as Sharif, was stabbed to death after answering the door at about 21:30 BST on 14 May.
His 68-year-old partner tried to intervene before she was also injured.
The offenders stole about £1,000 and jewellery of sentimental value, described as "high-purity gold Asian-style" items including bangles, rings, earrings and necklaces.
None of the jewellery has been traced.