Many relatives looked to the clear, bright morning sky as they spoke to the brothers and sisters they lost. Several held up photos of their loved ones.
"You're taking care of us from heaven but someday we'll be together," Iliani Flores said, choking up and raising her face to the sky in memory of her younger brother, a fire department paramedic.
Secretary of State Condoleezza Rice read a poem by Christina Rossetti after the second moment of silence. Gov. George E. Pataki, former Mayor Rudolph Giuliani and New Jersey Gov. Richard Codey also addressed the crowd.
"We all stand together to help each other and to help those who need our help in the future," Giuliani said. "We remember forever all the brothers and sisters that we lost on that day."
In Washington, President Bush marked the anniversary with his wife on the South Lawn, and throngs of people marched in remembrance of the attacks and in tribute to troops fighting overseas.