United Kingdom says Manchester attacker recently returned from Libya

However, security sources told The Times that their top priority is determining who constructed the bomb that caused such carnage at the Manchester Arena Monday night.

"The British police have been very clear that they want to control the flow of information in order to protect operational integrity", she said, adding that she had made it clear to the US that such leaks must not happen again.

The motive for carrying out the attack remained unknown on Wednesday morning.

His home in the Manchester suburb of Fallowfield was one of two that police raided in relation to the attack on Tuesday.

Home Secretary Amber Rudd said bomber Salman Abedi was known "up to a point" to the British intelligence services and police. He said his son last visited Libya about six weeks ago and had never gone to Syria.

Ramadan Abedi was later detained by masked gunmen while recording television interviews, according to ITV News. "This is not us".

Across London, troops fanned out and authorities reconsidered security plans.

That specific information has been shared between USA and British intelligence services, the United States officials said, adding they now have "high confidence" the information is accurate. British officials have not commented on whether Abedi had links to IS or other extremist groups.

"The question is: Was he acting alone or was he part of a network of others who want to kill". "I would like to send our deepest condolences to all of her family and friends", Upton said. Officials said all those hospitalized had been identified. No further details have been released.

Hashem had been "under surveillance for a month and a half" and "investigation teams supplied intelligence that he was planning a terrorist attack in the capital Tripoli", the Deterrence Force said on its Facebook page.

British Prime Minister Theresa May chaired a meeting Wednesday of her emergency security cabinet group to talk about intelligence reports on Abedi and concerns that he might have had outside support.

He was born in Manchester in 1994 to parents of Libyan birth and raised in Britain. Olivia CampbellABC News confirmed that 15-year-old Olivia Campbell was among the victims.

Reuters was unable to independently verify the links to Islamic State or Syria.

The elder Abedi was allegedly a member of the al-Qaida-backed Libyan Islamic Fighting group in the 1990s, according to a former Libyan security official, Abdel-Basit Haroun.

Abedi's father and elder brother Ismail were active at Disbury Mosque in south Manchester, said a trustee of the mosque, Fawzi Haffar.

She also expressed her displeasure at the leaking of information on the Manchester attack from USA officials, saying it was "irritating" and she had been clear that it must not happen again. "He's in Libya and has been for a while".

The UK police have identified a man they suspect of having perpetrated the attacker as 22-year-old Salman Abedi.

British media said Abedi was born in Manchester and that his Libyan parents had fled the regime of dictator Moamer Kadhafi. Nell JonesTeenager Nell Jones, who went to a school in the village of Holmes Chapel, south of Manchester, was described by a teacher as "a very popular girl, always smiling, always positive". Hett, reported to be 29, had appeared on the reality TV shows "Tattoo Fixers" and "Come Dine With Me".

After leaving school, he went on to begin a business and management course in 2014 at the nearby University of Salford.

Simon Turner, who said that two "young lads" lived in the house, was standing in the street when officers made the arrest. Neighbors recalled him as a tall, thin silent young man who often wore traditional Islamic dress. 2-4ins (about 1.9 metres), and very skinny.

Muye Li, a 23-year-old student who lives on the same floor as the raided apartment, said he thought officers were looking for a woman because they "asked me if I had seen the lady next door".

  • Leroy Wright