All Americans need to be vigilant to suspicious activity , officials say . In Washington , where increased police activity began after Labor Day , members of Congress , their staff and visitors were being urged Friday to continue their vigilance for anything suspicious , authorities said . SWAT teams , bomb squads and K9 units are already in Washington . Some national security will be out of the public eye , officials say . ` ` Continue your life as normal . Be vigilant , '' U.S. vice president says .
All Americans need to be vigilant to suspicious activity , officials say . SWAT teams , bomb squads and K9 units are already in Washington . Some national security will be out of the public eye , officials say . ` ` Continue your life as normal . Be vigilant , '' U.S. vice president says .