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.

CNN: Bush: Iraqi democracy making progress

He said every plot for an attack in the United States since September 11, 2001, had failed.

CNN: Cheney slams Obama in speech

Washington (CNN) -- A Senate committee began its assessment of intelligence reforms put in place after the September 11, 2001, terrorist attacks by focusing Wednesday on the alleged Christmas Day attack aboard a plane landing in Detroit, Michigan.

CNN: Senators hear testimony on alleged Christmas Day bomb plot

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.

CNN: New York subway system on alert