Detectives investigating the murder of Wisbech pensioner Una Crown want to trace three men seen near her home on the night of her death.
The men were reportedly seen in Magazine Lane, near Mrs Crown's home, between 11.30pm and 11.45pm on Saturday, January 12.
Mrs Crown's body was discovered at 10:45am the next day. Mrs Crown had been stabbed in the chest and neck. Her body was then set on fire in a bid to cover the crime.
Detective Chief Inspector Jon Hutchinson said: "We are very keen to identify these three men who were seen in the area of Magazine Lane as they may hold vital information which could help our investigation."
A £10,000 reward has been offered by independent charity Crimestoppers for information that leads to the arrest and conviction of those responsible for the murder.
Anyone with any information should call the Major Crime Unit on 101 or Crimestoppers, anonymously, on 0800 555111.
A reward of up to £10,000 is being offered for information which leads to the arrest and conviction of Una Crown's killer.
Crimestoppers has put up the reward in a bid to help police catch the offender responsible for the murder of the 86-year-old in Wisbech.
Una Crown's body was discovered in her bungalow in Magazine Lane at 10.45am on Sunday, January 13. A post-mortem examination found she had died from stab wounds to her neck and chest. Her clothing was set on fire after her death in an apparent effort to hide her injuries and destroy evidence.
If anyone knows anything at all about what happened they should contact Crimestoppers anonymously on 0800 555 111 or through the secure online form at [http://www.crimestoppers-uk.
Police have said a pensioner who was found murdered in her bungalow had been repeatedly stabbed and then set on fire.
The body of widow Una Crown, 86, was discovered on the floor in her bungalow in Magazine Lane, Wisbech, Cambridgeshire, shortly after 11am on Sunday.
A post-mortem examination revealed she had been "brutally" assaulted.
Forensic examinations were today continuing at the bungalow and a full investigation has been launched.
Detective Chief Inspector Jon Hutchinson, said: "This was a horrific murder of a defenceless elderly woman in her own home. She was stabbed several times then set on fire in an apparent attempt by her killer to hide her injuries and destroy evidence."