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9/11 anniversary: US marks 10 years since attacks 9/11 anniversary: US marks 10 years since attacks
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The US has started to mark the 10th anniversary of the 9/11 attacks on New York, Washington and Pennsylvania.The US has started to mark the 10th anniversary of the 9/11 attacks on New York, Washington and Pennsylvania.
Security is tight following warnings of a possible al-Qaeda attack.Security is tight following warnings of a possible al-Qaeda attack.
Relatives of those who died are gathering at the sites where four hijacked planes struck, killing nearly 3,000 people.Relatives of those who died are gathering at the sites where four hijacked planes struck, killing nearly 3,000 people.
An official memorial is to be unveiled at the site of the World Trade Center, whose twin towers were destroyed in the attacks.An official memorial is to be unveiled at the site of the World Trade Center, whose twin towers were destroyed in the attacks.
Metal barriers have been erected on roads near the World Trade Center, while police in New York and Washington are stopping and searching large vehicles entering bridges and tunnels. Metal barriers have been erected on nearby roads, while police in New York and Washington are stopping and searching large vehicles entering bridges and tunnels.
The CIA received a warning last week that al-Qaeda may have sent attackers, some of them possibly US citizens, to bomb one of the cities. The CIA received a warning last week that al-Qaeda might have sent attackers, some of them possibly US citizens, to bomb one of the cities.

Explore the 9/11 series

Explore the 9/11 series

The warning was described by officials as "credible but unconfirmed".The warning was described by officials as "credible but unconfirmed".
President Barack Obama has said the US remains vigilant against terrorism. President Barack Obama has arrived in New York for the ceremony.
As in previous anniversaries, the names of all the victims will be read out at the New York event. As in previous anniversaries, the names of all the victims will be read out at the site of the WTC.
There will be pauses for silence at the exact times when two airliners smashed into the World Trade Center's twin towers, the third was crashed into the Pentagon and the fourth was forced into a field in Shanksville, Pennsylvania, by passengers who fought with the hijackers. There will be pauses for silence at the exact times when two airliners smashed into the twin towers, the third was crashed into the Pentagon and the fourth was forced into a field in Shanksville, Pennsylvania, by passengers who fought the hijackers after learning of the other attacks.
New York's National September 11 Memorial, to be unveiled later on Sunday, features two reflecting pools, each almost an acre in size, in the footprints of twin towers. President Obama is due to travel to all three sites.
New York's National September 11 Memorial, to be unveiled later on Sunday, features two reflecting pools, each almost an acre in size, in the footprints of the twin towers.
The names of those who died on 9/11, as well as the six people killed in the 1993 World Trade Center bombing, are inscribed on the edge of the pools.The names of those who died on 9/11, as well as the six people killed in the 1993 World Trade Center bombing, are inscribed on the edge of the pools.
The ceremonies began at the US embassy in the Afghan capital, Kabul, where the flag was lowered to half-mast to remember those who died 10 years ago, as well as those who have died since. Sunday's ceremonies began at the US embassy in the Afghan capital, Kabul, where the flag was lowered to half-mast to remember those who died 10 years ago, as well as those who have died since.
A piece of the twin towers is buried underneath the flag pole.A piece of the twin towers is buried underneath the flag pole.
US forces were sent to Afghanistan to oust the Taliban from power after they had given sanctuary to al-Qaeda.US forces were sent to Afghanistan to oust the Taliban from power after they had given sanctuary to al-Qaeda.
Ambassador Ryan Crocker acknowledged that many in the US were "tired" of the 10-year war in Afghanistan.Ambassador Ryan Crocker acknowledged that many in the US were "tired" of the 10-year war in Afghanistan.
"We're here so there is never again another 9/11 coming from Afghanistan's soil," the AFP news agency quotes him as saying."We're here so there is never again another 9/11 coming from Afghanistan's soil," the AFP news agency quotes him as saying.
Overnight, insurgents attacked US bases in Bagram and Wardak, injuring about 80 US troops and killing two Afghan civilians, officials say.Overnight, insurgents attacked US bases in Bagram and Wardak, injuring about 80 US troops and killing two Afghan civilians, officials say.
President Obama is due to travel to all three sites for the commemorations, part of a weekend of events to mark the anniversary. On Saturday, President Obama said the US was stronger 10 years after the attacks. "As a resilient nation, we will carry on," he told Americans in his weekly address.
Speaking on Saturday, he said the US was stronger 10 years on from the attacks. "As a resilient nation, we will carry on," he told Americans in his weekly address. "Thanks to the tireless efforts of our military personnel and our intelligence, law enforcement and homeland security professionals, there should be no doubt: today, America is stronger and al-Qaeda is on the path to defeat.
"Thanks to the tireless efforts of our military personnel and our intelligence, law enforcement and homeland security professionals, there should be no doubt: today, America is stronger and al-Qaeda is on the path to defeat," President Obama said. "Yes we face a determined foe, and make no mistake - they will keep trying to hit us again. But as we are showing again this weekend, we remain vigilant."
"Yes we face a determined foe, and make no mistake - they will keep trying to hit us again. But as we are showing again this weekend, we remain vigilant," he added.
President Obama will be joined in New York by George W Bush, who was president at the time of the attacks.President Obama will be joined in New York by George W Bush, who was president at the time of the attacks.
Speaking in Shanksville on Saturday at the unveiling of a memorial to the 40 victims of flight United 93, Mr Bush said "the United States will never forget". Speaking in Shanksville on Saturday at the unveiling of a memorial to the 40 victims of flight United 93, Mr Bush said the US would "never forget".
He lauded the passengers and crew of the flight, saying they launched "the first counter-offensive in the war on terror". He lauded the passengers and crew of the flight saying they had launched "the first counter-offensive in the war on terror".
In an interview with National Geographic he said the events of that day had changed his presidency dramatically. In an interview with National Geographic, he said the events of that day had changed his presidency dramatically.
"I went from being a president that was primarily focused on domestic issues, to a wartime president. Something I never anticipated nor something I ever wanted to be.""I went from being a president that was primarily focused on domestic issues, to a wartime president. Something I never anticipated nor something I ever wanted to be."
Also on Saturday, firefighters from around the world attended a memorial service in New York's St Patrick's Cathedral to honour the 343 firefighters who died on 9/11 while rescuing people from the World Trade Center towers. Also on Saturday, firefighters from around the world attended a memorial service in New York's St Patrick's Cathedral to honour the 343 firefighters who died on 9/11 while rescuing people from the WTC towers.