Farmer Tony Martin, who was jailed for shooting dead a teenage burglar, will not face any charges after being investigated on suspicion of possessing an illegal firearm.
The 71-year-old was arrested last month after a police search of his home, apparently following comments he made to a newspaper reporter about the prevalence of unlicensed firearms in the UK.
Norfolk Police confirmed a firearm seized by officers at the time of Mr Martin's arrest was "was deemed not to be a viable weapon due to its condition" and said he will face no further action.
Mr Martin served three years in prison for shooting dead Fred Barras, 16, at his Norfolk home in 1999 in a case that sparked national debate on the defence of private property.
He was initially found guilty of murder but this was reduced to manslaughter on appeal.
Detectives have traced the mother of a baby after its body was discovered nearly 30 years ago.
The body of the new-born baby was discovered in a water filled pit in Weasenham St Peter, Norfolk, on 5th June 1988.
Despite a major inquiry at the time and subsequent investigations police were unable to identify what happened to the child.
However Norfolk Police obtained a DNA sample when the body was exhumed last year which led them ultimately to the baby's mother.
The Crown Prosecution Service is now considering whether the woman will face prosecution for offences including failing to register a birth and preventing a lawful burial.
The force said the mother was initially arrested on suspicion of infanticide.
But a spokesman added: "During police interview the woman revealed she had concealed her pregnancy from family and friends and delivered the baby by herself. The baby was delivered stillborn."
Norfolk Police has said that an "assessment is still being carried out around the munitions which may be on the aircraft". A statement said:
A policewoman who planned to sue the owner of a petrol station after tripping on a kerb while investigating a break-in has dropped her claim for damages.
The Police Federation, which represents rank-and-file officers, say PC Kelly Jones had withdrawn her civil claim.
In a statement, the federation said: "Contrary to media reports at the time PC Jones was not seeking a vast compensation payment, rather she was seeking monies that covered the income she had lost as a result of her injury.
"She will bear the financial loss with a hope that the wider concerns the public might have can be resolved by government and the police service for the future.
"This case raised a very real issue in that police officers find themselves financially disadvantaged when injured at work, with no other option other than to seek financial redress just as any other employee in any other industry would in the same circumstances."
Police officers have been criticised after a man injured in a car crash went undiscovered - lying in a ditch.
A member of the public found the man several hours after the crash on the A47 near Wisbech in July last year.
Following an investigation, the Independent Police Complaints Commission, concluded officers from Norfolk Police could have conducted a more thorough search.
The man's damaged car was reported to police who attended the scene but after identifying the car's owner and searching the area, the officers left, leaving a 'police aware' sticker on the vehicle.
The man was to the Queen Elizabeth Hospital in King's Lynn with life threatening injuries. He survived but is still recovering from his injuries.
Norfolk Police has apologised and "management action" has been taken against the officers involved.
Home Secretary Theresa May will today order Home Officials to look into the the extent of compensation claims made by police officers.
It follows a series of stories in the newspapers about police officers suing individuals for accidents which occurred in the course of duty.
Yesterday, the Sunday Times (£) reported that in the last 4 years more than 8,000 officers have successfully claimed compensation worth almost £70 million.
The figures appeared after a row prompted by WPC Kelly Jones of Norfolk Police, who is suing a garage owner after she fell on a curb while investigating a break in at his premises.
A police officer criticised for taking legal action against a petrol station owner after she tripped on a kerb answering a 999 call is also making a claim against her own force.
PC Kelly Jones is taking action against Norfolk Police in relation to a patrol car crash, the Daily Mail reports.
She is understood to have been a passenger in a patrol car which skidded off the road and ended up on its side during a high-speed pursuit of a suspicious vehicle near the village of Garboldisham in January 2012.
Norfolk Police said it could not comment on individual cases.
A spokesman for Pattinson Brewer, the law firm representing her, confirmed she had suffered a knee injury in a road traffic collision while on duty and that "liability for that incident was admitted by Norfolk Police Constabulary".
The Norfolk Police and Crime Commissioner Stephen Bett has called on a police officer to re-consider her decision to sue a garage owner after she tripped over a kerb during a call-out.
Mr Bett called for "common sense" in the case.
PC Kelly Jones is pursuing a claim, over injuries she suffered while responding to a call about a suspected break in at Thetford in Norfolk.
Click below to watch the interview with Stephen Bett:
The Police Federation has defended PC Kelly Jones in her law suit after she tripped on a curb while responding to a potential burglary.