The heroism of passengers and crew who died storming the cockpit of Flight 93 has been commemorated with a concrete-and-steel tower that will ring with wind chimes for every one of them at the spot where they fell to earth.

Relatives of the 40 people killed in the hijacking on September 11, 2001, attended the tower's dedication ceremony yesterday at the Flight 93 National Memorial site in Shanksville, Pennsylvania. There, they helped ring some of what will eventually be 40 aluminum chimes hung in what has been dubbed the Tower of Voices, one for each of those who died.

People attending the dedication stand around the 93-foot tall Tower of Voices at the Flight 93 National Memorial. Photo / AP
People attending the dedication stand around the 93-foot tall Tower of Voices at the Flight 93 National Memorial. Photo / AP

Officials concluded the terrorists who hijacked the flight from New Jersey to California were aiming the Boeing 757 toward Washington, to be used as an enormous airborne weapon against either the White House or the Capitol building in the final of four planned attacks. Nearly 3000 people died in the September 11 attacks, when terrorists seized control of four planes.

Events will be held across the US tomorrow to mark the 17th anniversary of the attacks.

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- AP