The following is a comparison between the attacks of Sept. 11, 2001 and March 11, 2004:

When
March 11: March 11, 2004; Morning rush hour
Sept. 11: Sept. 11, 2001; 8:46 a.m. EDT (American Flight 11 crashes into north tower of World Trade Center) to 10:07 a.m. EDT (United Flight 93 crashes in Pennsylvania)

Where
March 11:
Madrid, Spain
Sept. 11: New York, N.Y., Washington, D.C. and Shanksville, Pa.  

Attack Details
March 11: Ten bombs rock three Madrid train stations during height of morning rush hour; attack takes place three days before Spain's general elections
Sept. 11: Four jet airliners are hijacked. One (American Flight 77) is flown into the Pentagon outside Washington, D.C.; two (American Flight 11 and United Flight 175) are flown into the World Trade Center in New York; one (United Flight 93) crashes into a field in Shanksville, Pa.

Victims
March 11: 191 killed and 1,900 wounded
Sept. 11: 2,973 killed

Attackers
March 11:
Fourteen of the 18 people charged in the Madrid bombing are Moroccan. Alleged attack mastermind Sarhane Ben Abdelmajid Fakhe was killed, along with four others, in an explosion during a raid by Spanish police upon a Madrid apartment on April 3, 2004. Groups claiming affiliation with Al Qaeda took responsibility for the attack.
Sept. 11: Nineteen men hijacked the four planes, working in teams of five, except for Flight 93, which was commandeered by four men. All died during the attacks. Fifteen of the 19 were Saudi citizens, but the apparent leader, Mohamed Atta, was Egyptian. Al Qaeda leaders Usama bin Laden and Ayman al-Zawahiri months later took responsibility for the attacks.

Common Connection
Moroccan fugitive Amer Azizi was indicted Wednesday by a Spanish court, which accuses him of helping organize a meeting in northeastern Spain in July 2001 of key plotters in the Sept. 11 attacks, including Atta. Azizi is believed to have been involved in planning both attacks.