MANCHESTER, ENGLAND—The investigation into a suicide blast that killed at least 22 people at a pop concert dramatically widened Wednesday, with security services on two continents rounding up suspects amid fears that the bombmaker who devised the bolt-spewing source of the carnage remains at large.The arrests stretched from the normally quiet lanes of a northern English town to the bustling streets of Tripoli, where Libyan officials said they had disrupted a planned attack by the suspected bomber’s brother. But by day’s end, British authorities acknowledged that they remained vulnerable to a follow-up attack, with the nation’s state of alert stuck at “critical”—the highest possible level. Read more: U.K. raises terror level after concert attack in Manchester kills 22Woman who shielded family from blast identified as one of 22 killed in Manchester attackWhat we know about the Manchester attackerLet’s delete Islamic/Islamist labels for terrorists: ParadkarSky News on Wednesday aired two screengrabs of a man walking in Manchester’s Arndale shopping centre on Friday night carrying a blue backpack with a sales tag still hanging off of it.Sky did not say how in its report it obtained the footage.But the broadcaster reported that police think the man is the alleged bomber Salman Albedi and the backpack played a role in Monday’s attack. In London, the sight of soldiers deploying at landmarks such as Buckingham Palace and 10 Downing Street underscored the gravity of a threat that was known in general terms before Monday night’s explosion but has come sharply into focus in the 48 hours since.The morning after the attack, police had said they believed that the suspect, Abedi, a British citizen, had carried it out alone and had died in the blast he triggered. But in their statements Wednesday, authorities expressed growing confidence that Abedi—who had recently returned from a trip to Libya ...
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