MANCHESTER: Britain’s MI5 intelligence service has launched an internal probe into whether vital clues were missed ahead of the Manchester attack, as the city marked on Monday a week since the carnage that claimed 22 lives.

Manchester City Council called a vigil in the centre of the northwest English city at 2131 GMT — the exact moment that 22-year-old Salman Abedi detonated his bomb outside a pop concert by teen idol Ariana Grande in one of Europe’s biggest indoor arenas.

The names of the victims, including six children, were read out in front of the city’s town hall earlier on Monday in front of hundreds of people at an annual religious ceremony.Investigators meanwhile pushed ahead with their probe of the attack, which was claimed by IS. Authorities arrested a 23-year-old man in the southern coastal town of Shoreham-by-Sea, more than 400 kilometres from Manchester. That brings the total number of people now detained on UK soil to 14, all of them men.

MI5 are also looking at decisions taken in the case of Abedi, who used to be on a terror watchlist but was no longer on it at the time of the attack, and whether warnings about his behaviour were ignored amid mounting criticism of the security services.

“There is a lot of information coming out at the moment about what happened, how this occurred, what people might or might not have known,” interior minister Amber Rudd told Sky News. “It is right that MI5 take a look to find out what the facts are,” she said, adding: “We shouldn’t rush to make any conclusions at this stage”.

Two people who knew Abedi made separate calls to an anti-terrorism hotline to warn the police about his extremist views, British media have reported. The Mail on Sunday also cited a source saying US federal agents had been investigating Abedi since the middle of 2016 and had flagged up concerns to MI5.

The BBC reported that Abedi had taken part in the armed uprising against Libyan dictator Muammar Qadhafi’s regime as a teenager during school holidays.

British investigators have released pictures of Abedi taken from CCTV shortly on the night of the massacre, appealing to the public for help in tracing his movements in the days before.

Abedi could be seen wearing jeans and trainers, a black bodywarmer and a baseball cap, with the straps of the backpack believed to contain the bomb visible on his shoulders. The police statement said one of the last places he went to before the attack at the Manchester Arena venue was a city centre flat, where they believe he may have finished assembling the device.

None of the men arrested have been charged with a crime yet and police have up to 14 days in which to do so under special anti-terrorism laws.

Published in Dawn, May 30th, 2017