DHS chief: Be 'careful' at Mall of America after terror threat

Secretary of Homeland Security Jeh Johnson on Sunday warned the public to be "particularly careful" if they go to the Mall of America in Minnesota after a terrorist group released a video calling for attacks on it. "I would say that if anyone is planning to go to the Mall of America today, they've got to be particularly careful," Johnson said on CNN's "State of the Union."

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