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| Police have continued to search properties as part of their investigation |
MI5 is to hold an inquiry into the
way it dealt with warnings from the public that the Manchester suicide
bomber, Salman Abedi, was a potential threat.
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| A minute's silence for the victims and casualties was held before the Great Manchester Run |
Greater Manchester Police also said they executed search warrants at addresses in the Whalley Range area of Manchester and Chester.
Fourteen men are now being questioned by officers in connection with their investigation.
On Sunday, two men were arrested in Manchester - a 19-year-old man in Gorton and a 25-year-old man in the Old Trafford area.
- Manchester attack: Who were the victims?
- What we know about bomber Salman Abedi
- Special report: Manchester bombing
MI5 has launched a "post incident investigation" into how the Manchester bomber was overlooked, while a separate report is being prepared for ministers and those who oversee the work of the service.
A Whitehall official said previously that Abedi was one of a "pool" of former subjects of interest whose risk remained "subject to review" by the security service and its partners.
Born in Manchester to Libyan parents. BBC Newsnight reported that when Abedi was 16 he fought against the Colonel Gaddafi regime with his father during the school holidays.
It was while at Manchester College that two people who knew Abedi have confirmed they made separate calls to an anti-terrorism hotline to warn the police about his extremist views.
Soldiers withdrawn
Seven children were among those who died when the Abedi detonated a bomb on 22 May, at the end of a concert by US singer Ariana Grande at Manchester Arena.Greater Manchester Police have made an appeal to the public for information about his movements since 18 May, when he returned to the UK from abroad.