Army bomb disposal experts arrived at the college but the reported suspicious package was deemed safe. Police closed off a number of roads around the Castlefield campus on Linby Street in Hulmebecause of a suspicious package.
Akran Ramadan, who is part of the Libyan community in south Manchester, said he understood Abedi had been placed on a "watch list" after the mosque banned him and reported him to the authorities for his extremist views.
Grande cancelled concerts that were to take place Thursday and Friday in London, and in several other sites in Europe.
Police also carried out a controlled explosion to reach a terraced house in Moss Side in Manchester, although no arrests were made.
A British official told The Associated Press on Thursday that police in Manchester have chose to stop sharing information about their bombing investigation with the United States until they get a guarantee that there will be no more leaks to the media. There had been consternation over leaks of key evidence in the US.
Over the past three, days several key details of the investigation, including the name of the bomber, first came out in US media, angering British police who feared such leaks risked compromising their investigation.
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British police have also resumed sharing information with their counterparts in the USA after a brief suspension over a series of leaks by American officials to journalists providing details of the Manchester bomb investigation. Police are trying to identify who put together the bomb that was used in the attack.
Ramadan Abedi, the father of Salman Abedi, the bomber who killed 22 concert-goers in an attack in Manchester, gestures as he speaks to Reuters in Tripoli.
German authorities confirmed on Thursday that Salman Abedi flew to the German city of Düsseldorf, four days before the arena attack.
He had shown signs of extremism by flying black flag associated with Islamist groups from his Manchester home. French Interior Minister Gerard Collomb said Abedi had "likely" been to Syria after the trip to Libya, citing information provided by British intelligence services to their counterparts in Paris.
This undated photo obtained on May 25, 2017 from Facebook shows Manchester-born Salman Abedi, suspect of the recent Manchester terrorist attack. A statement by her family described her as "everyone's friend, thoughtful beyond belief with an effervescent and outgoing personality".
British Transport Police Chief Constable Paul Crowther said the force had "radically increased" its presence since the attack in Manchester. Full of fun, full of laughter, full of joy. She recalled leaving the concert when the blast struck and remembered an intense ringing in her ears, but not being entirely aware that she was bleeding badly from her legs. "However, I extend my hand and heart and everything I possibly can give to you and yours, should you want or need my help in any way".