Speaking from Downing Street after chairing a meeting of the COBRA (Cabinet Office Briefing Rooms) emergency response committee, the British Prime Minister said as many as 1,000 Army troops have already been deployed to boost security operations.
British officials are particularly angry that photos detailing evidence about the bomb used in the Manchester attack were published in The New York Times, though it was not clear where those came from.
British Home Secretary Amber Rudd said Abedi "likely" did not act alone in the strike at the close of an Ariana Grande concert Monday night and that he had been known to security forces "up to a point".
Manchester police arrested five men and one woman on Wednesday, bringing the total held for questioning to seven, and searched multiple addresses in northern and central England.
Meanwhile, Manchester Chief Constable Ian Hopkins told reporters Thursday that it was "absolutely understandable that this (leaking of information) has caused much distress for families that are already suffering terribly with their loss".
President Donald Trump on Thursday described United States intelligence leaks over the Manchester bombing as "deeply troubling" and threatened to prosecute those responsible, after a warning by British Prime Minister Theresa May to keep shared data "secure". This confirmation was stamped by British Prime Minister Theresa May.
"I am asking the Department of Justice and other relevant agencies to launch a complete review of this matter, and if appropriate the culprit should be prosecuted to the fullest extent of the law".
The New York Times said it did not publish the story lightly.More news: Here's what the Supreme Court might look at — Travel ban case
A spokesperson for the Libyan authorities told BBC that, "His brother felt there was something going on there in Manchester and he thought his brother would do something like bombing or attack".
"It's not acceptable to me that here there is a live investigation taking place, and we can not have information being put in the public domain that's not in the direct control of British police and security service", Burnham told the BBC Wednesday.
There are now eight people in custody in the United Kingdom but police fear more accomplices of Abedi may be on the loose. One of the suspect's brothers, Ismail Abedi, is among the eight arrestees.
Salman Abedi was born in Britain, but reports indicate he may have had contacts with extremists in multiple countries.
Police in Dusseldorf later confirmed that Abedi transited through the airport but remained in a secure zone.
"We were able to calm the young people in the neighbourhoods who felt they were targeted.as Muslims", he said.
The Greater Manchester Police are the lead investigators in the terrorist attack at the Manchester Arena that took the lives of 22 people and injured scores more. The patrols were due to begin immediately.