A man shot dead by police in Northumberland had previously had shotgun applications revoked, a chief constable has said.
Police forensic teams were searching the scene of the shooting
John Mark Scott, 42, died from a single shot fired by a police marksman in the village of Stocksfield on Saturday.
He had barricaded himself inside a house in Kimberley Gardens after being seen assaulting a woman in the street.
Northumbria Chief Constable Mike Craik said a loaded firearm and ammunition were later found in a house.
The Independent Police Complaints Commission (IPCC) is investigating the shooting.
Mr Craik said firearms officers were called shortly after 1800 BST on Saturday, when a policeman on his way to an unrelated incident saw Mr Scott assaulting the as-yet unidentified woman.
He said the officer tried to intervene, but was forced to use CS spray to defend himself when a shotgun was discharged. The officer was not hurt.
Mr Craik expressed "sympathy and sorrow" for the family of the dead man and for the people of Stocksfield, who he said had suffered a "profound trauma".
He said a post-mortem examination would be carried out on Mr Scott.
He added: "There is no more serious an act that a police officer can do than to take the life of an individual to protect others.
"I can promise that there will be a full and rigorous investigation into the incidents in Stocksfield on Saturday."
He said a search of Mr Scott's house revealed a loaded firearm and shotgun ammunition.
He said: "I can confirm that applications by John Mark Scott for shotgun licences in the past had been revoked by Northumbria Police."
IPCC duty commissioner Mehmuda Mian Pritchard said: "My thoughts are with the family and friends of Mr Scott.
"Our IPCC investigators are currently assessing the situation and a decision about how the investigation into his death will be carried out will be made in the next few days.
"We will ensure that any inquiry is thorough and impartial."
Villagers in the tight-knit community were said to be in a "state of shock".
Much of the village, which is about 15 miles west of Newcastle, was cordoned off with police diversions in operation on Sunday.
A police helicopter hovered over the village, while Kimberley Gardens, a row of cottages off the main road, was sealed off as police forensic teams searched the area.
Former Health Secretary Alan Milburn lives in a property about a mile away from the scene of the shooting.
Conservative councillor Eileen Drew, who represents Stocksfield on Tynedale District Council, said it was an "appalling" incident.
She said: "This sort of thing does not usually happen in a place like Stocksfield.
"This is normally a quiet community. Nothing really happens here.
"I have lived here for nearly 28 years and this is the first police incident I can ever remember."