Here we go again: Manchester terrorist was already known to authorities

CBS News confirmed Tuesday that the man who blew himself up the previous night at an Ariana Grande concert in Manchester, England, was 23-year-old Salman Abedi, who was known to British authorities prior to the attack. ...ISIS issued its claim of responsibility in a brief, generic statement that did not identify the bomber and appeared to get some of the facts of the attack wrong. It claimed a "caliphate soldier managed to place a number of devices among a gathering of crusaders in Manchester, and detonated them." U.S. intelligence sources told CBS News they were exercising caution on the early claim of responsibility from ISIS. Authorities are still looking into whether it was a killer who acted alone or who might have had some level of support from the terror network. U.S. intelligence officials were offering assistance in the investigation, as is standard practice in any case involving a close ally.