At least three of the suspects in the Madrid attacks were known to European and Arab intelligence officials for some time.

But they did not begin to get all of the answers until the Madrid attacks.

Both men have been arrested and charged with murder for the Madrid attacks.

The black ribbon was a symbol of popular grief in Spain after the 11 March 2004 Madrid attacks.

American counterterrorism officials were careful not to speculate about who might be responsible for the Madrid attacks, deferring to the Spanish government.

"The Madrid attack was my project, and those who died as martyrs were my dearest friends."

The video has provided evidence that the bombers were happy to let Al Qaeda take responsibility for the Madrid attacks after the fact.

In Britain, the shock of the Madrid attacks made a developing threat seem more imminent.

That solidarity clause, though not yet implemented, worked rather well in the face of the Madrid attacks.

In Washington, Bush administration officials said they still could not comfortably assign responsibility for the Madrid attacks.