All Americans need to be vigilant to suspicious activity , officials say . SWAT teams , bomb squads and K9 units are deployed in Washington . National security officials have `` been running a process for four months , anticipating the need to be extra vigilant , to take extra precautions around this anniversary , the 9/11 anniversary , because , as you would expect , al Qaeda , while it lost its leader when we brought justice to Osama bin Laden , remains a threat to Americans , remains interested in attacking the United States and Americans , and we have to be vigilant against that threat , '' Carney said . 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 . We have a lot going on here that we don't want you to know about right now. "