The man suspected of shooting dead Sergeant Matt Ratana in a south London custody suite is 23-year-old Louis De Zoysa, Sky News has confirmed.
The suspect, who remains in hospital in a critical condition and has therefore not been spoken to by detectives, is from Norbury, south London.
Sgt Ratana, 54, was allegedly attacked by the man, who was handcuffed and who investigators say then shot himself. No police weapons were fired and the case is not being treated as terror-related.
Sgt Ratana was originally from Hawke's Bay on New Zealand's North Island, but had served in the Metropolitan Police for much of his career.
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He is the eighth officer in the UK to be shot dead in the last 20 years.
Friends and teammates of the officer, who was a popular head coach at East Grinstead Rugby Club, gathered in tribute to the "irreplaceable" and "incredibly generous" man.
Boris Johnson also paid tribute to officers who had died in the line of duty and who "represent the very best of us".
The prime minister said: "They laid down their lives to prevent us from coming to harm and we owe them a huge debt.
"The dedication and selflessness that they showed in serving their communities will never be forgotten."
Image:The National Police Memorial in London was held in tribute
Earlier, Metropolitan Police Commissioner Dame Cressida Dick, London Mayor Sadiq Khan and Home Secretary Priti Patel laid wreaths at the National Police Memorial in central London as part of the commemorations.
All three stood for a minute's silence to remember officers who had been killed while on duty.
Three more counties are to be placed under local lockdowns on Monday, the Welsh Government has announced.
Neath Port Talbot, Torfaen and Vale of Glamorgan will have tighter Covid-19 restrictions from 18:00 BST on Monday.
It means half of Wales' 22 local authority areas will be under local lockdowns, as rules come into force in Cardiff and Swansea later on Sunday.
Almost two million people in Wales - two-thirds of the population - will be under local lockdowns.
Vale of Glamorgan council leader Neil Moore said it had not been an easy decision but pointed to the rate of infection rising to 34.4 people per 100,000 in the county borough.
"We have taken a decision today for early and preventative action," he said.
"One of the main reasons for this is that the sooner we stop the increase in transmission, the sooner the restrictions can be lifted.
"We must now all work together to make that possible."
Blaenau Gwent on 202 per 100,000 and Merthyr Tydfil at 169 per 100,000 currently have the highest rates of infection.
Neath Port Talbot council leader Rob Jones said: "These restrictions are being imposed to protect public health, to protect you and your loved ones, and to stop people dying.
"Rates are much higher in local authority areas which border our county borough but we are now seeing rising rates here in Neath Port Talbot.
"We need the help of everyone across Neath Port Talbot to prevent the increasing spread of coronavirus and to bring the infection rates back down."
Mr Jones also urged people against panic buying, adding: "There is no need to be concerned about stocks running low."
Torfaen council leader Anthony Hunt said: "I know the introduction of restrictions is always a difficult decision, but it is a decision I support in order to protect people's health and to try and break the chain of transmission in Torfaen and stop the situation from getting worse.
"We have already seen this strategy work effectively in Caerphilly and Newport where numbers have dropped dramatically due to people adhering to the new rules."
Welsh local lockdown rules mean extended households must end and people are not allowed to leave or enter the council boundaries without a reasonable excuse.
People are allowed to travel outside the area for a limited number of reasons.
These include going to work if they are not able to work from home, to go to school, give care, or buy food or medical supplies.
Blaenau Gwent, Bridgend, Caerphilly, Merthyr Tydfil, Newport and Rhondda Cynon Taf are all under lockdown, as is Llanelli in Carmarthenshire, which on Saturday became the first town to have restrictions imposed which do not apply to the wider county.
Cardiff and Swansea both go into lockdown at 18:00 BST on Sunday.
From Monday evening, almost 1.9m of Wales' 3.1m people will be subject to local coronavirus rules.
First Minister Mark Drakeford said: "We are now taking further action and placing three more areas under local restrictions in south Wales - Neath Port Talbot, Torfaen, and the Vale of Glamorgan - because we are seeing rising rates in these three areas. These areas also share borders with local authority areas where rates are much higher.
"Introducing restrictions in any parts of Wales is always an incredibly difficult decision for us to make. But we're acting to protect people's health and to try and break the chain of transmission and stop the situation from getting worse.
"This is not a regional lockdown - this is a series of local restrictions in each local authority area to respond to a specific rise in cases in each area, which have distinct and unique chains of transmission."
Support for business
Welsh Conservative health spokesman Andrew RT Davies said: "The first minister might not want it to be described as a 'regional lockdown' but with two million people in the south Wales corridor now under some form of restrictions that's unfortunately what it is."
He called for a more targeted approach - "local not regional" - and said there needed to be urgent financial support for businesses affected.
Meanwhile Mr Drakeford said a meeting would take place next week with leaders of councils in north Wales, where he said the position "continues to be mixed".
"If we need to take action, we will, but the position isn't as clear there yet as it has been in the south and I want to make sure that we look at it with the detail it deserves," he added.
Three more counties are to be placed under local lockdowns on Monday, the Welsh Government has announced.
Neath Port Talbot, Torfaen and Vale of Glamorgan will have tighter Covid-19 restrictions from 18:00 BST on Monday.
It means half of Wales' 22 local authority areas will be under local lockdowns, as rules come into force in Cardiff and Swansea later on Sunday.
Almost two million people in Wales - two-thirds of the population - will be under local lockdowns.
Vale of Glamorgan council leader Neil Moore said it had not been an easy decision but pointed to the rate of infection rising to 34.4 people per 100,000 in the county borough.
"We have taken a decision today for early and preventative action," he said.
"One of the main reasons for this is that the sooner we stop the increase in transmission, the sooner the restrictions can be lifted.
"We must now all work together to make that possible."
Blaenau Gwent on 202 per 100,000 and Merthyr Tydfil at 169 per 100,000 currently have the highest rates of infection.
Neath Port Talbot council leader Rob Jones said: "These restrictions are being imposed to protect public health, to protect you and your loved ones, and to stop people dying.
"Rates are much higher in local authority areas which border our county borough but we are now seeing rising rates here in Neath Port Talbot.
"We need the help of everyone across Neath Port Talbot to prevent the increasing spread of coronavirus and to bring the infection rates back down."
Mr Jones also urged people against panic buying, adding: "There is no need to be concerned about stocks running low."
Torfaen council leader Anthony Hunt said: "I know the introduction of restrictions is always a difficult decision, but it is a decision I support in order to protect people's health and to try and break the chain of transmission in Torfaen and stop the situation from getting worse.
"We have already seen this strategy work effectively in Caerphilly and Newport where numbers have dropped dramatically due to people adhering to the new rules."
Welsh local lockdown rules mean extended households must end and people are not allowed to leave or enter the council boundaries without a reasonable excuse.
People are allowed to travel outside the area for a limited number of reasons.
These include going to work if they are not able to work from home, to go to school, give care, or buy food or medical supplies.
Blaenau Gwent, Bridgend, Caerphilly, Merthyr Tydfil, Newport and Rhondda Cynon Taf are all under lockdown, as is Llanelli in Carmarthenshire, which on Saturday became the first town to have restrictions imposed which do not apply to the wider county.
Cardiff and Swansea both go into lockdown at 18:00 BST on Sunday.
From Monday evening, almost 1.9m of Wales' 3.1m people will be subject to local coronavirus rules.
First Minister Mark Drakeford said: "We are now taking further action and placing three more areas under local restrictions in south Wales - Neath Port Talbot, Torfaen, and the Vale of Glamorgan - because we are seeing rising rates in these three areas. These areas also share borders with local authority areas where rates are much higher.
"Introducing restrictions in any parts of Wales is always an incredibly difficult decision for us to make. But we're acting to protect people's health and to try and break the chain of transmission and stop the situation from getting worse.
"This is not a regional lockdown - this is a series of local restrictions in each local authority area to respond to a specific rise in cases in each area, which have distinct and unique chains of transmission."
Support for business
Welsh Conservative health spokesman Andrew RT Davies said: "The first minister might not want it to be described as a 'regional lockdown' but with two million people in the south Wales corridor now under some form of restrictions that's unfortunately what it is."
He called for a more targeted approach - "local not regional" - and said there needed to be urgent financial support for businesses affected.
Meanwhile Mr Drakeford said a meeting would take place next week with leaders of councils in north Wales, where he said the position "continues to be mixed".
"If we need to take action, we will, but the position isn't as clear there yet as it has been in the south and I want to make sure that we look at it with the detail it deserves," he added.
Detectives investigating the murder of a police officer in south London have arrested a man on suspicion of supplying a firearm.
Sgt Matiu Ratana, from New Zealand, died in hospital on Friday after being shot in Croydon as a handcuffed suspect was being taken into custody.
Officers made the arrest at about 02:00 BST in Norwich.
The suspect in the shooting, who is thought to have shot himself, remains in a critical condition in hospital.
He had initially been arrested for an alleged drugs offence and possession of ammunition.
The shots were fired as officers prepared to search the suspect - who was still handcuffed - with a metal detector, according to watchdog the Independent Office for Police Conduct (IOPC).
The new arrest comes as Sgt Ratana, 54, was remembered by friends and teammates at East Grinstead Rugby Club, where he was head coach.
image copyrightPA Media
Dame Cressida Dick, speaking at the National Police Memorial in central London earlier, said she "hadn't been surprised at all" by the number of tributes paid to him.
"Matt was an extraordinary person... he had a wonderful personality and he was very good at his job," she said, adding that he was a "proud Kiwi".
Officers have been focused on four crime scenes in London and Surrey as part of the investigation.
Searches continue at Croydon Custody Centre, where the shooting happened, an address in Park Road, Banstead, Surrey, and an address in Southbrook Road, Norbury.
The search of another scene in Pollards Hill, where the suspect was initially arrested, has ended and cordons have been removed.
The arrest took place in Norwich around 2am this morning and the suspect is currently being detained at a south London police station.
Image:Tributes have been paid to the sergeant and rugby coach
Meanwhile, the suspect for the shooting remains in a critical condition in hospital and officers investigating the murder say they have not yet been able to speak to him.
Sgt Ratana, 54, was allegedly attacked by a man who had been handcuffed who investigators say then shot himself.
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Friends and teammates of the officer, who was a popular rugby head coach, have gathered in tribute to him.
Silences were held at East Grinstead Rugby Club and also at the National Police Memorial in London where a wreath-laying ceremony took place.
More from Matt Ratana
Metropolitan Police Commissioner Dame Cressida Dick described him as an "extraordinary person", adding: "He had a wonderful personality and he was very good at his job."
Image:Metropolitan Police Commissioner Dame Cressida Dick laid a wreath to mark National Police Memorial Day
Image:Dame Cressida Dick with Home Secretary Priti Patel
She said Sgt Ratana's death brings home the challenges of police work.
She said: "If some good can come out of this terrible incident... it would be that more people can understand a little bit about the challenges of police work.
"And to see us police as who we are - human beings, going to work to help people, to support people and to protect people.
There are also clusters of cases among students in Dundee, Edinburgh and Aberdeen. More than 1,000 students across the country are now believed to be self-isolating.
The Scottish government reported 344 new positive cases on Sunday, down from a rise of 714 on Saturday.
One further death following a positive test was registered and the number of people in hospital with recently confirmed Covid-19 increased by six.
On 24 September, 43.3% of infections were in the 15-19 age group, with 18.7% in 25 to 44 year olds and 17.2% in 20 to 24 year olds.
Positive cases among the oldest age groups remain very low.
Infections by age goup
Although the 15-19 range will include infections in school-age children as well, it is likely most positive cases are at the upper end of the group - many of whom started university two weeks ago.
Tessa Mairi Morrison, a Glasgow University fresher student who tested positive, said morale among her flatmates was low.
"Four of us have been tested positive, two people have been tested negative and the rest haven't been tested," she told the BBC's Politics Scotland show.
"And we can't social distance in the flat either, it's impossible. We've got a small kitchen and there's 11 of us cooking at the one time.
"So the people who don't have coronavirus are going to get it."
Ms Morrison said she believed it was a "mistake" to put people into halls of residence.
"Maybe they should have tested everyone beforehand, before putting us into halls, or strictly containing it in halls without spreading it to the rest of Glasgow - or even putting us in halls in December, because this is a bit of a nightmare," she added.
Students are banned from returning home under Scottish Covid-19 regulations because they are deemed to have formed a new household with the people they are now living with.
How are infection rates changing among age groups?
Since 1 August, the infection rates in younger age groups have been higher, with rates in the over-65s very low.
The highest rate has generally been in the 20-24 age group, but there was a significant change in mid-September.
How infection rates are changing
Weekly average per 100k people
The chart illustrates this by taking the average number of infections from the previous seven days and dividing it by the population of the age group.
On 24 September, the rate per 100,000 in the 15-19 age group stood at 48.7. The rate for the next highest group (20-24 year olds) was 18.5.
Deputy First Minister John Swinney said the Scottish government's advice to all students was to stay in their halls of residence "if they are able to do so".
"That's to ensure that we minimise the spread of the virus around the country," he told BBC Scotland.
"It's important that any student who is self-isolating - or students in general who are in halls in the situation that they are facing - are given the full and proper support of the university or the college that is supporting them.
"That's obviously an issue that we've prioritised in our discussions with universities in the course of the last few days."