Terrorism, September 11 | featured news

The Supreme Court heard a challenge to a federal law, enacted after the Sept. 11 attacks, that authorized intercepting international communications involving Americans.

A diminished but resilient al-Qaida, whose 9/11 attacks drew America into its longest war, is attempting a comeback in Afghanistan's mountainous east even as U.S. and allied forces wind down their combat mission and concede a small but steady toehold to the terrorist group....

Eleven years after the 9/11 attacks, there is new information on what the George W. Bush administration knew about al-Qaeda's plans. We learned after 9/11 that a presidential briefing paper in August 2001 was headlined "Bin Laden Determined to Strike in U.S." But Tuesday in the New York Times, investigative reporter Kurt Eichenwald says the White House received ominous warnings as early as May 2001.

The arraignment of five Guantanamo prisoners accused of plotting the September 11 attacks got off to a rocky start on Saturday when the defendants removed their earphones and refused to listen to a translation of the judge's questions.

Al Qaeda's core organization is likely incapable of carrying out another mass-casualty attack on the scale of September 11, 2001, U.S. intelligence and counterterrorism officials said on Friday.

The United States on Wednesday announced charges against Khalid Sheikh Mohammed, the accused mastermind of the September 11, 2001, terrorist attacks, and four others accused of involvement in the plot.

The Taliban hit back with a vengeance following the US-led invasion of 2001.

Swedish police arrested four people on suspicion of preparing a terror attack and evacuated an arts center in Sweden's second largest city on the eve of the 9/11 anniversary, officials said Sunday.

A mother in Malaysia greeted her dead son. People in Manila left roses for the victim who helped give them homes. And mourners in Tokyo stood before a piece of steel from ground zero, remembering the 23 bank employees who never made it out alive.

A hacker broke into the Twitter account of NBC News and sent out a handful of false tweets about a suspected hijacking and a plane attack at ground zero just days before the tenth anniversary of 9/11.