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NEW YORK -- The ceremony marking the 10th anniversary of the Sept. 11 attacks in lower Manhattan has paused for the first of six moments of silence.

The moments mark the times that each plane hit the towers; when each tower fell; and the attacks on the Pentagon and Flight 93. Houses of worship throughout the city were asked to toll their bells for the first moment of silence at 8:46 a.m., which marks when the first plane hit the North Tower. The second moment of silence came at 9:03 a.m. to mark when the second plane hit the South Tower.

The city is observing the anniversary Sunday at the National September 11 Memorial at the World Trade Center site. The ceremony is also serving as the memorial's official opening. The site opens to the public Monday.

The centerpiece of the ceremony is the reading of the names of those who died in the attacks.

Obama reads from Bible during 9/11 ceremony

President Barack Obama is reading from Psalm 46 as part of the ceremony at the World Trade Center site to mark the 10th anniversary of the Sept. 11 attacks.

Each year at the city's Sept. 11 observance, politicians are asked to read passages from selected texts, rather than give speeches, so as not to detract from the centerpiece of the ceremony, the reading of victims' names.

Psalm 46 speaks of God as refuge and strength, dwelling in “his city.”

Former President George W. Bush and former New York Mayor Rudy Giuliani were also slated to read during the ceremony.

The city is observing the anniversary Sunday at the National September 11 Memorial at the World Trade Center site. The ceremony is also serving as the memorial's official opening.

Bush reads Civil War letter

Former President George W. Bush has read aloud at the World Trade Center site a letter that was written by Abraham Lincoln to a mother who lost all five of her sons in the Civil War.

Bush and President Barack Obama stood in silence as a church bell rang twice on the moment when the first jetliner struck the trade center ten years ago.

Obama then read from Psalm 46, which reminds the faithful that God is a refuge and strength that dwells in “his city.”

Cellist Yo Yo Ma played mournful music as relatives of the dead began entering a transformed ground zero. The memorial opens to the public tomorrow. It sits next to a construction project where office towers, a transportation hub and a cultural center are taking shape. The signature skyscraper is rising quickly and will be the tallest in the country when completed.

Some relatives wore solemn black suits. Others wore fire department T-shirts.

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