Federal investigators said Thursday that they have solved a mystery of the Sept. 11, 2001, attacks: the collapse of World Trade Center building 7, a source of long-running conspiracy theories.

U.S. Rep. David Price, the man in Congress who sends money to the Department of Homeland Security, does not think we're safer than we were Sept. 10, 2001, at least in a broad, world view.

Part 2:Guards said they routinely beat their prisoners in Afghanistan to retaliate for al-Qaida's Sept. 11 attacks, unaware that the vast majority of the detainees had little or no connection to al-Qaida.

A 5-4 ruling by the U.S. Supreme Court gives terror suspects the right to challenge their detention.

The world's most notorious captured terrorist and the Navy captain assigned to defend him are embarking on a legal odyssey that could last years and ultimately might help define the constitutional parameters of the United States' role in the global war on terrorism.

A military judge Thursday denied motions to delay the arraignments of five Guantanamo detainees suspected of mounting the Sept. 11 terrorist attacks.

People who lost relatives in the Sept. 11 attacks fear alleged mastermind Khalid Sheikh Mohammed will use his coming war-crimes trial to boast about his role and rally support for al-Qaida.

Was accused of training terrorists.

Experts cite a change in Army policy.