Shanksville PA

NEW YORK — A day of mourning for nearly 3,000 Sept. 11 victims began Saturday with moments of silence and tears near ground zero, and with observers bracing for protests over a mosque planned blocks away on what is usually an anniversary free of politics.

Chants of thousands of sign-waving protesters both for and against the planned Islamic center were expected after — and perhaps during — an annual observance normally known for a sad litany of families reading names of loved ones lost in the 2001 terrorist attacks.

Family members gathering at observances in New York and Pennsylvania brought flowers, pictures of loved ones and American flags, but no signs of opposition or support for the mosque. Reading victims' names along with rebuilders at ground zero in New York, they urged a restrained tone.

"Let today never, ever be a national holiday. Let it not be a celebration," said Karen Carroll, who lost her brother, firefighter Thomas Kuveikis. "It's a day to be somber; it's a day to reflect on all those thousands of people that died for us in the United States."

Bagpipes and drums played to open the ceremony, followed by brief comments by Mayor Michael Bloomberg.

"Once again we meet to commemorate the day we have come to call 9/11. We have returned to this sacred site to join our hearts together, the names of those we loved and lost," Bloomberg said. "No other public tragedy has cut our city so deeply. No other place is as filled with our compassion, our love and our solidarity."

Moments of silence were held at 8:46 a.m. and 9:03 a.m., the times hijacked jetliners hit the north and south towers of the World Trade Center. President Barack Obama and first lady Michelle Obama were attending separate services in Washington and Shanksville, Pa., for victims at the Pentagon and a rural field.

But the rallies planned in New York embroiled victims' family members in a feud over whether to play politics.

The heated mosque debate — pitting advocates of religious freedom against critics who say putting an Islamic center so close to ground zero disrespects the dead — led Obama to remind Americans on Friday, "We are not at war against Islam."

In his Saturday radio address, he alluded to the contentious atmosphere.

"This is a time of difficulty for our country," he said. "And it is often in such moments that some try to stoke bitterness — to divide us based on our differences, to blind us to what we have in common.

But he added, "we do not allow ourselves to be defined by fear, but by the hopes we have for our families, for our nation, and for a brighter future."

A threat to burn copies of the Muslim holy book on the anniversary — which had set off international protests — was apparently called off. The Florida pastor who made the threat flew to New York on Friday night and appeared Saturday on NBC's "Today" show.

He said his church would not burn the Quran, a plan that inflamed much of the Muslim world and drew a stern rebuke from Obama.

"We feel that God is telling us to stop," he told NBC. Pressed on whether his church would ever burn the Islamic holy book, he said: "Not today, not ever. We're not going to go back and do it. It is totally canceled."

He said that he flew to New York in the hopes of meeting with leaders of the Islamic center but that no such meeting was scheduled.

Imam Feisal Abdul Rauf, leader of the planned mosque, said Friday that he was "prepared to consider meeting with anyone who is seriously committed to pursuing peace" but had no meeting planned with Jones.

There was no immediate reaction to Jones' comments in Afghanistan, where on Saturday shops and police checkpoints had been set afire as thousands of people protested the planned burning and chanted "Death to America" in Logar province. At least 11 people were injured Friday in similar protests in Badakhshan province.

In Indonesia, the world's most populous Muslim country, cleric Rusli Hasbi told 1,000 worshippers at Friday prayers that whether or not Jones burns the Quran, he already has "hurt the heart of the Muslim world."

Activists in New York insisted their intentions were peaceful. More than 1,000 protesters on both sides of the issue were expected to converge at the mosque site, a former clothing factory two blocks north of the trade center site.

"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."

Four red, white and blue balloons rose early Saturday from a public telephone booth near the building. Police cars lined the blocked-off street in front of the building.

Rosario Piedrahita, arriving with a bouquet of flowers and a photograph of her nephew, victim Wilder Alfredo Gomez, said she opposed using the site for a mosque.

"I say it's not good," she said. "It's like people standing up to celebrate after a victory."

John Bolton, who was U.S. ambassador to the United Nations under President George W. Bush, was expected to send a videotaped message of support to the anti-mosque rally, as was conservative blogger Andrew Breitbart. Anti-Islam Dutch politician Geert Wilders, who advocates banning the Quran and taxing Muslim women who wear head scarves, planned to address the crowd in person, as do a handful of Republican congressional candidates who have made opposition to the mosque a centerpiece of their campaigns.

Muslim prayer services are normally held at the site, but it was padlocked Friday and closed Saturday, the official end of the holy month of Ramadan. Police planned 24-hour patrols until next week. Worshippers on Friday were redirected to a different prayer room 10 blocks away.

While the president was at the Pentagon service Saturday and the first lady was to join former first lady Laura Bush at Shanksville, Vice President Joe Biden spoke at the New York ceremony, where 2,752 people were killed when two jetliners flew into the trade center. Bells were to toll to mark the times that each tower collapsed.