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07/02: Security beefed up for July 4th weekend; The politics of peas in guacamole

Reports of a shooting at the Navy Yard in Washington, D.C. turned out to be a false alarm. But the intense response by law enforcement was an example of heightened concern about terrorist attacks. CBS News correspondent Jeff Pegues reports; A recent spike in shark attacks off the North Carolina coast has instilled fear in many beachgoers. At the same time, scientists aren't sure yet what's causing the increased activity. CBS News correspondent Vicente Arenas reports.
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