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ISIS expanding battlefield: Are they a threat to the US?

03:04

Throughout the U.S., security is being stepped up in light of the Paris attacks, with the NFL says it's stepping up security at Sunday games. This comes as the F.B.I. is sending a small team to Paris to help gather more intelligence. Former F.B.I. Deputy Director Sean Joyce TODAY’s Erica Hill to discuss whether or not ISIS could launch a similar attack in the U.S.