By Kylie MacLellan and Andrew Yates

LONDON/MANCHESTER, May 25 (Reuters) - British Prime Minister Theresa May said on Thursday she would tell U.S. President Donald Trump that intelligence shared between their two countries had to remain secure after leaks to U.S. media about the Manchester attack.

British police stopped sharing information about the suicide bombing with the United States, a British counter-terrorism source told Reuters earlier, after police chiefs said the leaks to media risked hindering their investigation.

Police are hunting for a possible bomb-maker after the 22-year-old attacker, British-born Salman Abedi, detonated a sophisticated device at a concert venue packed with children on Monday night, killing 22 people.

May said she would talk to Trump at a NATO summit later on Thursday about the leaks, which included the publication of photographs of the bomb site by the New York Times.

"I will make clear to President Trump that intelligence that is shared between our law enforcement agencies must remain secure," she said in a televised statement.

The decision to stop sharing police information with U.S. agencies was an extraordinary step as Britain sees the United States as its closest ally on security and intelligence.

"This is until such time as we have assurances that no further unauthorised disclosures will occur," said the counter-terrorism source, who spoke on condition of anonymity.

Many European cities, including Paris, Berlin and Brussels, have suffered attacks in the last two years, underlining the importance of confidential intelligence cooperation.

Trump was widely criticised this month after it emerged he had discussed sensitive Syria-related intelligence, originating from an ally, with Russian officials at a White House meeting. May said at the time Britain would continue to share intelligence with Washington.

The official threat level in Britain was raised after the Manchester attack to "critical", its highest level, meaning a further attack could be imminent. Troops have been deployed to free up police officers for patrols and investigations.



FALSE ALARM

England's National Health Service said a total of 116 had been injured in the attack, with 75 admitted to hospital. Twenty-three remained under close care.

Soldiers and bomb disposal experts rushed to a street in the south of the city after a call to police, but it turned out to be a false alarm.

Queen Elizabeth visited the Royal Manchester Children's Hospital, where some of the casualties have been treated. A minute's silence was observed in honour of the victims at a square in central Manchester and in other places in Britain.

The bombing, which took place at the Manchester Arena indoor venue just after the end of a concert by U.S. pop singer Ariana Grande, was the deadliest in Britain since July 2005, when 52 people were killed in attacks on London's transport network.

The Manchester attack has caused revulsion across the world because it targeted children and teenagers, who make up the bulk of Grande's fan base. The victims range from an eight-year-old schoolgirl to parents who had come to pick up their children.

A total of eight people are in custody in connection with the attack. British media have reported that one of them is Abedi's brother but police have not confirmed that.

Abedi's father and younger brother were arrested in Tripoli in Libya, where the family originally come from.

Manchester's police chief said on Wednesday Abedi was part of a network, and media have reported that authorities suspect he received help constructing the bomb and planning the attack.

Police chiefs have made clear they are furious about the publication of confidential material in U.S. media, including bomb site photographs in the New York Times, saying such leaks undermined relationships with trusted security allies.

"This damage is even greater when it involves unauthorised disclosure of potential evidence in the middle of a major counter-terrorism investigation," a National Counter Terrorism Policing spokesman said in a statement.

Britain routinely shares intelligence with the United States bilaterally, and also as part of the "Five Eyes" network which also includes Australia, Canada and New Zealand.



CRIME SCENE PICTURES

The pictures published by the New York Times included remains of the bomb and of the rucksack carried by the suicide bomber, and showed blood stains amid the wreckage.

"I think it's pretty disgusting," said Scott Lightfoot, a Manchester resident, speaking outside a train station in the city. He criticised media for publishing such material.

"Who's leaking it Where's it coming from This is British intelligence at the end of the day, people shouldn't be finding out about this."

The Financial Times reported that such images are available across a restricted-access encrypted special international database used by government ordnance and explosives experts in about 20 countries allied with Britain. It said the database was built around a longstanding U.S.-British system.

The BBC said Manchester police hoped to resume normal intelligence relationships soon but were furious about the leaks.

U.S. channel ABC News reported that police had found a kind of bomb-making workshop in Abedi's home and he had apparently stockpiled enough chemicals to make additional bombs.

British news website The Independent also reported bomb-making materials which could be primed for imminent attacks had been found in the raids following the Manchester bombing. The report said one suspect device was blown up in a controlled explosion.

Britain routinely shares intelligence with the United States, and also as part of the "Five Eyes" network which also includes Australia, Canada and New Zealand. International cooperation





<^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ Manchester bombings. Deadly attacks in Europe Europe http://tmsnrt.rs/2oOKyf7 Map of central Manchester, locating concert hall http://tmsnrt.rs/2rKy5Y1

^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^> (Additional reporting by Kate Holton, Alistair Smout, William James, William Schomberg and Paul Sandle; Writing by Estelle Shirbon and Guy Faulconbridge; Editing by Ralph Boulton) ((estelle.shirbon@thomsonreuters.com))

Keywords: BRITAIN SECURITY/MANCHESTER (UPDATE 4, PIX, TV, GR



* May to tell Trump: our information must remain secure

* UK furious after evidence leaked to U.S. media

* New York Times publishes photographs of bomb site

* Police say have made "significant" arrests

(.)

By Kylie MacLellan and Andrew Yates

LONDON/MANCHESTER, May 25 (Reuters) - British Prime Minister Theresa May said on Thursday she would tell U.S. President Donald Trump that intelligence shared between their two countries had to remain secure after leaks to U.S. media about the Manchester attack.

British police stopped sharing information about the suicide bombing with the United States, a British counter-terrorism source told Reuters after police chiefs said the leaks to media risked hindering their investigation.

Police are holding eight people in custody in connection with the attack, which killed 22 people, and Manchester's Chief Constable Ian Hopkins said the arrests were significant.

"I want to reassure people that the arrests that we have made are significant, and initial searches of premises have revealed items that we believe are very important to the investigation," he told reporters.

The official threat level in Britain was raised after the Manchester attack to "critical", its highest level, meaning a further attack could be imminent. Troops have been deployed to free up police officers for patrols and investigations.

Hopkins said on Wednesday that the 22-year-old suicide bomber, Salman Abedi, was part of a network. Born in Manchester to Libyan parents, Abedi had recently returned from Libya, according to the interior minister.

He blew himself up at the Manchester Arena indoor venue after a concert by U.S. singer Ariana Grande, whose fan base is made up largely of children and teenagers. The victims ranged from an eight-year-old schoolgirl to parents who had come to pick up their children.

The attack also injured 116 people, of whom 75 were admitted to hospital and 23 remain in a very serious condition, health authorities said on Thursday.



DISTRESS

Hopkins said the leaks of details of the investigation to U.S. media, which included forensic photographs of the bomb site published by the New York Times, had been hurtful to the families of the victims.

"It is absolutely understandable the distress and upset that this caused to these families that are already suffering," he said.

May said she would talk to Trump at a NATO summit later on Thursday about the leaks, which included the publication of photographs of the bomb site by the New York Times.

"I will make clear to President Trump that intelligence that is shared between our law enforcement agencies must remain secure," she said in a televised statement.

The decision to stop sharing police information with U.S. agencies was an extraordinary step as Britain sees the United States as its closest ally on security and intelligence.

"This is until such time as we have assurances that no further unauthorised disclosures will occur," said the counter-terrorism source, who spoke on condition of anonymity.

The BBC said later Interior Minister Amber Rudd was now confident the leaks, which she had described as irritating, would now stop.

British authorities did not say that the investigation had in fact been compromised by the leaks.

Many European cities, including Paris, Berlin and Brussels, have suffered attacks in the last two years, underlining the importance of confidential intelligence cooperation.

Britain routinely shares intelligence with the United States bilaterally, and also as part of the "Five Eyes" network which also includes Australia, Canada and New Zealand.

Trump was widely criticised this month after it emerged he had discussed sensitive Syria-related intelligence, originating from an ally, with Russian officials at a White House meeting. May said at the time Britain would continue to share information with Washington.



"A CITY UNITED"

Queen Elizabeth visited the Royal Manchester Children's Hospital, where some of the casualties have been treated. L8N1IR329

A minute's silence was observed in honour of the victims at a square in central Manchester and other places across Britain.

The city's two giant soccer clubs, Manchester United and Manchester City, laid aside their fierce rivalry to jointly donate 1 million pounds ($1.3 million) to an emergency fund set up to support families affected by the attack. They labelled their initiative "A City United".

The bombing has caused revulsion across the world because it targeted children and teenagers.

British media have reported that one of the eight people under arrest is Abedi's brother but police have not confirmed that. Abedi's father and younger brother were arrested in Tripoli in Libya.

The pictures published by the New York Times included remains of the bomb and of the rucksack carried by the suicide bomber, and showed blood stains amid the wreckage.

"I think it's pretty disgusting," said Scott Lightfoot, a Manchester resident, speaking outside a train station in the city. He criticised media for publishing such material.

"Who's leaking it Where's it coming from This is British intelligence at the end of the day, people shouldn't be finding out about this."

The Financial Times reported that such images are available across a restricted-access encrypted special international database used by government ordnance and explosives experts in about 20 countries allied with Britain. It said the database was built around a longstanding U.S.-British system.

U.S. channel ABC News reported that police had found a kind of bomb-making workshop in Abedi's home and he had apparently stockpiled enough chemicals to make additional bombs.

($1 = 0.7719 pounds) (Additional reporting by Andy Bruce, Kate Holton, Alistair Smout, William James, William Schomberg and Paul Sandle; Writing by Estelle Shirbon and Guy Faulconbridge; Editing by Ralph Boulton) ((estelle.shirbon@thomsonreuters.com))