Tuesday morning's solemn ceremony at the site where the site where Flight 93 went down six years ago was highlighted by a visit from Homeland Security Director Michael Chertoff and an address by Gov. Ed Rendell.

Hundreds showed up for the ceremony honoring the victims of Flight 93, many of them family members.

The special tribute started with a moment of silence, followed by loved ones reading the victims' names. As each name was read, bells tolled. The service was punctuated as 40 white doves were released, one for each victim.

Rendell and Chertoff spoke of the incredible strength and bravery shown by the passengers and crew, and they urged Americans to do all they can to see that the permanent memorial becomes a reality.

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National Coverage: Families Mourn, Remember 9/11 Victims

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Those closest to the crash victims said honoring their loved ones is the most important thing.

"You have to go forward. That's why we're here for the memorial. It will be here for everybody," said Jerry Bingham, whose brother died in the crash.

Many attendees said they will continue to come back every year to memorialize their loved ones.

The ceremony followed a special service held Monday night at the Somerset Alliance Church, where the focus was not on the 40 crew members and passengers who died, but rather on the people of the Shanksville area.

Flight 93 families said they wanted to pay tribute to the community that comforted them after Sept. 11 and has cared for the temporary memorial honoring their loved ones.

In New York City on Tuesday, gray skies and a light rainfall provided a grim backdrop to the ceremony honoring the 2,700 people who died in the attacks on the World Trade Center.

This year, victims' relatives gathered at a lower Manhattan Park to hear the reading of the names. Family members were allowed to leave flowers for their loved ones.

In Washington, President George W. Bush took part in a moment of silence honoring all of those who died, including victims of the Pentagon attack.