Will ISIS attacks spread to U.S.?

Kashmiri demonstrators hold up a flag of the Islamic State of Iraq and the Levant (ISIL) during a demonstration against Israeli military operations in Gaza, in downtown Srinagar on July 18, 2014. The death toll in Gaza hit 265 as Israel pressed a ground offensive on the 11th day of an assault aimed at stamping out rocket fire, medics said. AFP PHOTO/Tauseef MUSTAFA (Photo credit should read TAUSEEF MUSTAFA/AFP/Getty Images)

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    Will ISIS attacks spread to U.S.?

Jim Sciutto explains the threat ISIS poses to the United States and Europe.