This morning in New York, moments of silence were observed at 8:46 and 9:03 a.m., the times two planes slammed into the trade center towers on Sept. 11, 2001, and at 9:59 and 10:29, when the two towers collapsed. Family members of those killed at the World Trade Center read the names of the victims to mark the third anniversary of the attacks. The listing of the 2,749 people killed took more than three hours.

At Arlington National Cemetery, there was a moment of silence at 9:37, the time that another hijacked plane hit the Pentagon and in Pennsylvania, more than 1,500 people gathered where Flight 93 crashed.

President Bush observed a moment of silence at the White House. At Arlington National Cemetery, Defense Secretary Donald H. Rumsfeld joined relatives of those killed in the Pentagon.

Family members of victims descended into the pit of the trade center site to the two small reflecting pools which symbolize the two trade tours. The area has become a sacred spot for families who have no official gravesite to mourn at.

President Bush and Senator Kerry each spoke about the anniversary. Bush took the moment to remind people of the terrorism that caused the attacks. 'We will not relent until the terrorists who plot murder against our people are found and dealt with,' Bush said in a radio address.

Kerry spoke about the experience of September 11th. 'We are one America in our prayers for those who were taken from us on September 11 and for their families,' he said. 'And we are one America in our unbending determination to defend our country to find and get the terrorists before they get us.'

Three years later, all the human remains from the trade center cite has still not been identified. A cornerstone for the 1,776 foot Freedom tower has been laid at the site where the towers once stood. At sundown, two light beams will be projected upward from a lot near the site and will remain on through the night.