Cambridgeshire Police are searching a number of properties in March and Wisbech after two men were arrested on suspicion of murdering the 86-year-old.
The arrests come a month after the investigation was re-launched with a fresh team of detectives from the Bedfordshire, Cambridgeshire and Hertfordshire Major Crime Unit. The renewed appeal led to several people coming forward with information.
"We have really been encouraged by the response from the public so far.
"We believe there are people out there with information who we haven't spoken to and I would urge them to call police."
Two men have been arrested on suspicion of the murder of Wisbech pensioner Una Crown.
Police investigating the killing of the 86-year-old have arrested a 40-year-old man in March and a 36-year-old man in Wisbech.
The arrests come a month after the investigation was re-launched. The renewed appeal led to several people coming forward with information.
Mrs Crown was last seen alive on Friday, January 11, last year, but had spoken to a friend by telephone at about 5pm on the Saturday. Her body was discovered by a family member at her home in Magazine Lane the following morning.
She had been repeatedly stabbed and then set on fire in an apparent attempt to disguise her injuries and destroy evidence.
A £10,000 Crimestoppers reward is on offer for information which leads to the arrest and conviction of those responsible for the murder.
Anyone with any information should call police on 01707 355666 or Crimestoppers, anonymously, on 0800 555111.
A 20-year-old man has been left fighting for his life after being stabbed in Wisbech.
The victim suffered potentially life-threatening injuries during the attack in a field at Wisbech Rugby Club in Chapel Road between 9.30pm and 10.30pm on Friday.
Police said he remained in a serious but stable condition in hospital.
His attacker is described as Polish, white, blond, in his early 20s and with a tattoo on his right forearm. He was wearing black clothing and made off on a dark red bicycle.
Det Con Emily Nutton, of Norfolk Police, said: "This was a nasty, isolated, incident and it is only sheer luck that the victim did not suffer more serious injuries.
"The area was very busy at the time of the stabbing and I would urge anyone who saw what happened to call police.
"We also have a very good description of the offender and I would appeal to anyone who recognises them to contact us."
A man who raped a 14 year old girl and sexually abused another has been jailed for 15 years.
Emil Dopson, 60, abused the teenagers when he was living in Wisbech in the 1990s, but nobody came forward until 2012. Officers traced Dopson to an address in Surrey and arrested him for rape and indecent assault.
Dopson, who now lives in Kingston upon Thames, was convicted of rape, but acquitted of the other charge in his trial at Cambridge Crown Court.
Members of the public in an area of Wisbech have been told to keep their windows and doors closed following an Ammonia leak.
Residents in Mount Pleasant Road have been urged to take the precaution.
Firefighters and an incident response unit were called to a leak at a site in the area earlier this morning.
Fire crews wearing gas tight suits are currently investigating, and people have been warned to avoid the area until further notice.
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Police investigating the murder of Wisbech pensioner Una Crown say they're investigating several new leads.
Last week the investigation was re-launched and since then a number of new witnesses have come forward.
Now police want to identify several people who were seen in the area of Magazine Lane around the time she was killed on January 12, last year.
It is now 16 months since the 86-year-old was found dead in her home.
Police say they've already received new information in their hunt for the killer of a pensioner in Wisbech.
86 year old Una Crown was stabbed to death in her home at Wisbech in January last year.
16 months on detectives have relaunched their investigation with new house to house inquiries.
They're also revisiting witnesses. A ten thousand pound reward has been offered.
Police say a decision to re-launch the investigation into the murder of a Wisbech pensioner is not a criticism of officers' work so far.
Sixteen months after 86-year-old Una Crown was found stabbed to death and set alight in her home at Magazine Lane, the case remains unsolved and no-one has been charged over the killing.
Today, Cambridgeshire Police announced they were re-launching the investigation in the hope of uncovering new witnesses and information.
But the force said that should not be taken as criticism of the work done by police over the past 16 months and that officers had "worked tirelessly" to try to find Mrs Crown's killer.
Stuart Leithes reports.