Ahmed Bin Salem, a spokesman for Rada, the Libyan Special Deterrence Force, added: "We have evidence that he is involved in Daesh [Isis] with his brother". "Eight men remain in custody for questioning", the police tweet said.
A severe threat still means an attack is "highly likely", according to the scale set by Britain's Joint Terrorism Analysis Centre.
However, the poll also suggested that 41 percent of respondents believe the Conservatives would handle defense and security best, compared to 18 percent who said the same of Labour. Police had earlier given the man's age as 23.
"I have been thinking of my fans, and of you all, nonstop over the past week", she told fans.More news: Manchester bomber's final moments revealed as terror threat downgraded
More news: National view: Middle East peace starts in Saudi Arabia
More news: UK prime minister 'very angry' over Manchester leaks
The singer writes she is returning to Manchester to spend time with fans and hold a benefit concert that will raise money for the victims and their families.
Mr Rowley said: "They are very significant, these arrests".
"We have seized thousands of exhibits which are now being assessed", Chief Constable Ian Hopkins said.
"We can't let the terrorists win by dissuading us from going about our normal business".
With British police investigating an alleged network linked to the British-born suicide bomber, Salman Abedi, the matter of information leaked to US media will be taken up by British Prime Minister Theresa May when she meets President Donald Trump at a later North Atlantic Treaty Organisation summit, the BBC reported.
Britain's Queen Elizabeth speaks to Amy Barlow, 12, from Rawtenstall, Lancashire, and her mother, Kathy during a visit to the Royal Manchester Children's Hospital in Manchester, Britain, May 25, 2017.
Photo: Reuters Concert goers react after fleeing the Manchester Arena after the explosion.