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Qaeda and isis. no claims of responsibility here. police are treating this as a terrorist incident. the working hypothesis is it was a suicide bomber. no claims of responsibility yet, but lots of celebrating as you said online and the chat rooms where that would happen. appreciate you being here. i want to bring in now to the coverings law enforcement expert jim cavanaugh who has among his many years of experience in law enforcement a lot of time working with explosives and working with extremist at the atf. thanks for being with us tonight. appreciate it. >>ness that, rachel. >> what are the ...