A policeman has been killed and another man found dead after officers were called to a house in Shropshire.
West Mercia Police said officers attended a domestic incident in New Park Road, in the Castlefields area of Shrewsbury, at 0610 BST on Sunday.
They were confronted by a man with a firearm, and a constable was shot. He was pronounced dead in hospital.
A man in his 30s was found dead and a firearm recovered. No-one else is being sought by police.
POLICE MEMORIAL ROLL
1994 - Pc Lewis Fulton. Knifed while responding to a 999 call in Glasgow
1997 - Pc Nina Mackay. Stabbed to death in Stratford, east London
1999 - Pc Raja Ahmed. Killed by car thief in Manchester
2001 - Pc Alison Armitage. Run over by a car thief in Oldham, Greater Manchester
2001 - Pc Malcolm Walker. Rammed off his police motorbike in Birmingham
2003 - Pc Stephen Oake. Died of stab wounds during an anti-terror raid in Manchester
2003 - Pc Ian Broadhurst. Shot after stopping a motorist in Leeds on Boxing Day
2005 - Pc Sharon Beshenivsky. Shot dead as she arrives at a robbery scene in Bradford
2007 - Unnamed male Pc. Shot dead in Shrewsbury while attending a domestic incident.
It was reported that the man in his 30s and his girlfriend had been asked to leave a local pub in Shrewsbury on Saturday night after they had been arguing.
People living nearby reported hearing shouting and two loud bangs on Sunday morning.
Neighbour Richard Duggan said he came out of his flat and was told to take shelter by police.
"I ran down the back alleyway and there was an adjoining alleyway and we saw more armed police officers turn up," he said.
"The police were in full control and they kept everybody back and after a short while an ambulance reversed up on to the path and we saw the shot police officer being lifted into the ambulance."
Tony Robinson, a newsagent's relief manager, said: "I looked out of the window and there were armed police swarming all over the place."
Mr Robinson said the road was a normal, suburban street, with a mix of terraced, semi-detached and detached homes.
Eyewitnesses reported hearing two loud bangs
Another resident who gave her name as Emma said: "I saw the police run out of North Park Road and they just said to everybody to stay in their house that there's a gunman on the loose.
"That's when a boy up the road said that there was a body bag brought out."
West Mercia Police Federation said it would be doing all it could in the coming months to support the dead officer's family and his colleagues.
Chief Constable Paul West said he had met members of the dead officer's family and they were "understandably devastated".
"Any death is a huge tragedy for all involved and on this occasion the death of a serving police officer has had a profound effect on everyone who works for West Mercia Constabulary.
"I would like to pay tribute to that officer's bravery and dedication in responding to that incident and also his colleagues up and down the country who do likewise."
Mr West appealed for any witnesses to get in touch with police.
Sgt Andy White, federation chairman, said: "Incidents of this nature are quite rare.
"Officers understand the risks they face every time they come on duty.
"This incident yet again underlines the risks that they face and the bravery they display in carrying out their duties."
The Independent Police Complaints Commission (IPCC), which investigates shootings involving police officers, has been informed.