NEW YORK — They will read the names, of course, the names of every victim who died in the Sept. 11 attacks. The bells will ring. And then that moment of unity will give way to division as activists hoist signs and march, some for and some against a planned Islamic center two blocks from ground zero.
This 9/11 is more political and contentious than the eight before it, with grieving family members on opposite sides of the mosque battle.
The debate became so heated that President Obama felt the need to remind Americans: "We are not at war against Islam."
Still, there were signs Friday that religious tensions were abating, and that hushed tones would replace the harsh rhetoric that threatened to overshadow the commemoration of the terrorist attacks that killed nearly 3,000 people in New York, Washington and Shanksville, Pa.
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The son of an anti-Muslim pastor in Florida confirmed that his father would not — at least for now — burn copies of the Quran, a plan that inflamed much of the Muslim world and drew a stern rebuke from Obama.
Activists in New York insisted their intentions were peaceful.
"It's a rally of remembrance for tens of thousands who lost loved ones that day," said Pamela Geller, a conservative blogger and host of the anti-mosque demonstration. "It's not a political event, it's a human rights event."
The site of the proposed mosque and Islamic center is already used for services, but it was padlocked Friday, closed until Sunday. Police guarded the block, and worshippers were redirected to a different prayer room 10 blocks away.
Some supporters planned a vigil near the proposed Islamic center's site Friday evening instead of today, saying they wanted to avoid entangling the mosque controversy and the Sept. 11 observance.
Organizers "believe that tomorrow is a day for mourning and remembrance," said Jennifer Carnig, a spokeswoman for the New York Civil Liberties Union, one of the vigil's sponsors.
As on other 9/11 anniversaries, official ceremonies were planned at the three locations where the terrorists struck. Obama will be at the Pentagon, Vice President Joe Biden will go to New York, and first lady Michelle Obama and former first lady Laura Bush will travel to Shanksville.
Obama said at a White House news conference that Sept. 11 would be "an excellent time" for the country to reflect on the fact that there are millions of Muslims who are American citizens, that they also are fighting in U.S. uniforms in Afghanistan, and "we don't differentiate between 'them' and 'us'' It's just 'us.' "
Biden will attend the largest commemoration, at a park near ground zero, where 2,752 people were killed when Muslim extremists flew planes into the twin towers of the World Trade Center. Houses of worship in the city will toll bells at 8:46 a.m., when the first plane struck the North Tower, and three more times to mark the moment the second plane hit the South Tower and to observe the times each tower fell.
Activists are organizing a pair of rallies — one against the planned Islamic center, one supporting it — to follow the official ceremony.
Sally Regenhard, who lost her firefighter son, Christian Regenhard, planned to attend the morning ceremony and the anti-mosque protest.
"The purpose is to speak out and express our feelings that this mosque, the location of it, is a grievous offense to the sensitivity of 9/11 families," Regenhard said. "There's nothing political about people who want to speak out against something they think is so wrong, so hurtful and so devastating."
But Donna Marsh O'Connor, whose pregnant daughter, Vanessa, was killed in the attacks, supports the mosque. She said she strongly opposes the anti-mosque rally and the political motivations behind it.
"It's more of the same hate-mongering and fear-mongering that's been going on for years," O'Connor said. "People have a right to free speech. But if they're talking about sensitivities to 9/11 families, why are they rallying and doing events on a day we should spend thinking about those we lost?"
New York Archbishop Timothy Dolan spoke out Friday against today's planned New York protests, saying Sept. 11 "has become a holy day in our community and our nation."
"We must never allow Sept. 11th to become a time for protest and division," he added. "Instead, this day must remain a time for promoting peace and mutual respect."