Ten years on from the day the 9/11 terrorist attacks changed so much for so many people, the world's leaders and millions of citizens are pausing to reflect.
From Sydney to Atlanta, formal ceremonies are planned or already under way to remember the nearly 3,000 who perished from more than 90 countries. And, in a reminder that threats remain, authorities in Washington and New York are beefing up security in response to intelligence about possible plans for a car bomb attack.
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A day before the anniversary commemorations, US President Barack Obama made a pilgrimage Saturday to Arlington National Cemetery, strolling with his wife, Michelle, among graves filled with dead from the Afghanistan and Iraq wars. And he invoked the common purpose that arose from carnage a decade ago in telling Americans that the nation cannot be broken by terrorism "no matter what comes our way."
Obama also visited a soup kitchen, where he and his family helped prepare trays of gumbo for the needy in America's capital, underscoring the call to national service that rang so loudly after the terrorist attacks.
In Manila, dozens of former shanty dwellers offered roses, balloons and prayers for another 9/11 victim, American citizen Marie Rose Abad. The neighborhood used to be a shantytown that reeked of garbage. But in 2004, Abad's Filipino-American husband built 50 brightly colored homes, fulfilling his late wife's wish to help impoverished Filipinos.
The village has since been named after her.
"It's like a new life sprang from the death of Marie Rose and so many others," said villager Nancy Waminal.
In New Zealand, players from the American Eagles rugby team were among the first to mark the anniversary at a Sunday memorial service in the town of New Plymouth. The players, who are participating in the Rugby World Cup tournament, listened to a speech by US ambassador David Huebner, whose brother Rick survived the attacks on the World Trade Center.
"We watched live on television the brutal murder of 3,000 individuals," Huebner said. "We reacted with near unanimous horror and sadness."
"As we mark the 10th anniversary of that day, we commemorate the triumph of human kindness, and the humanity and self-abrogation which sets us apart from every other species on this planet Earth."
In Australia, Sydney resident Rae Tompsett said she's never felt angry over the murder of her son Stephen Tompsett, 39, a computer engineer who was on the 106th floor of the World Trade Center's north tower when it was hit by a hijacked plane.
"No, not anger," she said. "Sorrow. Sorrow that the people who did this believed they were doing something good."
The retired school teacher and her husband Jack, 92, were planning to attend Sunday morning mass as usual at their local church before going to a commemorative service in the afternoon.
"It's incredible that it is 10 years - it feels a bit like yesterday," Tompsett said.
In Japan, families gathered in Tokyo to pay their respects to the 23 Fuji Bank employees who never made it out of their World Trade Center office. A dozen of the workers were Japanese.
One by one, family members laid flowers in front of an enclosed glass case containing a small section of steel retrieved from Ground Zero. They clasped their hands and bowed their heads. Some took pictures. Others simply stood in solemn silence. There were no tears, just reflection.
South Korea's President Lee Myung-bak sent a letter to US President Barack Obama, conveying his "deepest condolences" to the victims of the 9/11 tragedy, their bereaved families and the American public. Lee, whose country is one of the strongest allies of the United States, called the attacks "unpardonable" and praised decade-long US efforts to fight terrorism.
Pakistan joins mourners
And leaders in Pakistan, which has been a victim of al-Qaeda terrorism but is also accused of not doing enough to crack down on militants, said they joined the people of the US in honoring the memory of those killed 10 years ago.
"As a country that has been severely affected by terrorism, we reaffirm our national resolve to strengthening international cooperation for the elimination of terrorism," the foreign ministry said in a statement.
Meanwhile, authorities in New York and Washington are increasing security for their 9/11 memorial services after intelligence agents got a tip that three al-Qaeda members could be planning to set off a car bomb in one of the cities. Officials have found no evidence any terrorists have sneaked into the country.
The Taliban marked the anniversary by vowing to keep fighting against US forces in Afghanistan and saying they had no role in the Sept. 11 attacks.
"Each year, 9/11 reminds the Afghans of an event in which they had no role whatsoever," a statement emailed to news organizations said. "American colonialism shed the blood of tens of thousands of miserable and innocent Afghans."
The US and its allies invaded Afghanistan on Oct. 7, 2001, after the Taliban who then ruled the country refused to hand over Sept. 11 mastermind Osama bin Laden. The al-Qaeda leader was at the time living in Afghanistan, where the terror network retained training camps and planned attacks against the US and other countries.