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''Today we've had a national tragedy.'' - President Bush, from Sarasota, Fla.

--- ''My mother is going crazy. I just hope (my brother's) alright. He's my work-out partner. He's my hangout partner. I'm just in shock now.'' - Edwin Cruz, 34, whose brother, Richard, works in the World Trade Center.

--- ''I heard a 'boom.' People were jumping off the building everywhere. They were just jumping.'' - Serena Mays, a construction worker on the Williamsburg Bridge, which leads into Manhattan from Brooklyn.

--- ''Everyone was screaming, crying, running, cops, people, firefighters, everyone. It's like a war zone. There are many injured.'' - Mike Smith, a New York fire marshal.

--- ''It's just sick. It just shows how vulnerable we really are.'' - Keith Meyers, 39, of Westerville, Ohio.

--- ''It looked like a ticker tape parade because there were parts of the building floating down with the dust.'' - Matthew Low, 29, of Manhattan.

--- ''I just can't believe what's happened. God, my heart goes out to all of these people, believe me. I just hope there is justice.'' - Martha Ridley, whose daughter died in the April 1995 Oklahoma City bombing.

--- ''The fact is that there is a level of sophistication and coordination that no counter-terrorism expert had ever previously anticipated, and we don't have a group that we can immediately identify that has this kind of capability.'' - Anthony Cordesman, a terrorism expert from the Washington-based Center for Strategic and International Studies.

--- ''I just saw my two towers fall. I'm devastated beyond belief. In many respects this is significantly worse than Pearl Harbor, and we don't know who the enemy is.'' - Lewis Eisenberg, chairman of the Port Authority of New York and New Jersey, which operates the World Trade Center.

--- ''All of a sudden there were people screaming. I saw people jumping out of the building. Their arms were flailing. I stopped taking pictures and started crying.'' - Michael Walters, a freelance photo journalist in Manhattan.