1 Boston bombing suspect dead; massive manhunt for 2nd, the "white hat" suspect [VIDEO]

The city of Boston remains in virtual lockdown as law enforcement engaged in a massive sweep for one of two suspects in the Boston Marathon bombing who escaped during a police pursuit early this morning. The second suspect was killed in a firefight with law enforcement.

During a long night of violence, the two suspects killed an MIT police officer, injured a transit officer in a firefight, and threw explosive devices at police during their getaway attempt.

Federal sources believe the suspect who is still alive is either wearing an explosive vest, or has explosives with him, reports national security correspondent Bob Orr. Read more

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