Similar security measures were put in place at those locations for a period after the September 11 terror attacks in the United States.
The White House has been closed to public tours since the September 11 terror attacks -- except for school, youth, military and veterans group tours arranged by a member of Congress.
She spearheaded coverage of major world news, from the September 11, 2001 terror attacks, to the wars in Iraq and Afghanistan.
Mr Bush authorised the Terrorist Surveillance Programme, as the secret interception scheme is known, after the 11 September terror attacks in 2001.
The London service was attended for the first time by US ambassador William Farrish who had been invited to take part following the 11 September terror attacks.
The classified program has been in existence since shortly after the September 11, 2001, terror attacks.
Bush ordered the attack on Afghanistan after the September 11, 2001, terror attacks on the United States, which were coordinated and conducted by Osama bin Laden's al Qaeda.
And since the September 11, 2001, terror attacks, Amtrak reports it has added police personnel, increased use of bomb sniffing dogs and now requires passengers to show identification before boarding its trains.
Since the September 11, 2001, terror attacks against the United States, Bear has been used to search for explosives on cruise ships, baggage and cargo entering and leaving the Los Angeles Harbor.
Since the September 11, 2001, terror attacks, NORAD has regularly launched fighter jets to track aircraft in unusual situations such as when they deviate from flight plans, lose radio contact or enter restricted airspace.
CNN: Crew of wayward airliner cooperative, sober, police say
Panetta's assessment came just days before the one-year anniversary of the U.S. commando raid on bin Laden's compound in Abbottabad, Pakistan, that ended a manhunt for the al Qaeda founder that began following the September 11, 2001, terror attacks.
CNN: Panetta: 'No kind of silver bullet' to destroy al Qaeda
Anderson added that Delta, which owns Northwest, has followed all guidelines set by the government since the 1996 mid-air explosion of TWA Flight 800 -- which killed all 230 people aboard -- and the September 11, 2001, terror attacks.
Married with two daughters, he became a born-again Christian following the terror attacks on 11 September 2001.
The actor, who is married with two daughters, became a born again Christian following the terror attacks on 11 September 2001.
Next week will also see the release of a celebrity fundraising single for victims of Aids in Africa, and for victims of the terror attacks of 11 September in New York.
Since the terror attacks in the US on 11 September, there has been unparalleled uncertainty in the aircraft industry with an estimated 20, 000 jobs disappearing worldwide.
And the e-mail sent by special adviser Jo Moore after the terror attacks in the US on 11 September 2001 saying it would be a good "to bury" bad news triggered a number of reviews into their role and power.
New York has been on "orange" alert, or the second-highest level -- indicating a high risk of terror attack -- since the color-coded warning system was established after the September 11, 2001 attacks.
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