"Credible and Serious" Terror Threat

Sources tell CNN that Al Qaeda in the Arabian Peninsula is in the final stages of planning for an unspecified operation.  The State Department is issuing a global alert for Americans traveling abroad for the entire month of August. Also, as a precaution, 21 U.S. embassies will close on Sunday.  Anderson discussed the situation with terrorism analyst Paul Cruikshank, national security analyst and former White House Homeland Security Advisor Fran Townsend,  and also CNN’s Dana Bash and Jill Dougherty.