Any well armed and coordinated could put together such an attack. It would not have to be ISIS. It could be white militia operating from Montana, it could be Black Panthers, it could be American Indians from South Dakota. It is doubtful for coordinated attacks to happen.
A very good weapon against such attacks is for the NSA to listen in to phone conversations and to monitor social media networks. It is always good to know what subversive groups are planning before the plans are carried out.
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