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terror threat fourth of july weekend sciutto dnt lead_00001309
terror threat fourth of july weekend sciutto dnt lead_00001309

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    U.S. steps up security ahead of holiday

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U.S. steps up security ahead of holiday

Federal, state and local law enforcement agencies are on high alert this Fourth of July weekend. CNN's Jim Sciutto reports.

U.S. steps up security ahead of holiday

Federal, state and local law enforcement agencies are on high alert this Fourth of July weekend. CNN's Jim Sciutto reports.