All Americans need to be vigilant to suspicious activity , officials say . SWAT teams , bomb squads and K9 units are deployed in Washington . Some toughened security will be out of the public eye , officials say . `` Continue your life as normal . We have a lot going on here that we don't want you to know about right now. "
All Americans need to be vigilant to suspicious activity , officials say . SWAT teams , bomb squads and K9 units are deployed in Washington . Some toughened security will be out of the public eye , officials say . `` Continue your life as normal . Be vigilant , '' U.S. vice president says .