11 September 2011 Last updated at 18:02

In pictures: 9/11 anniversary

A US flag flies over Ground Zero before the start of ceremonies marking the 10th anniversary of the 9/11 attacks on the World Trade Center, in New York September 11, 2011

The US is marking the 10th anniversary of the 9/11 attacks on New York, Washington and Pennsylvania in which nearly 3,000 people perished.

US President Barack Obama (R), with US First Lady Michelle Obama, former US President George W. Bush and Laura Bush visit the 9/11 memorial

President Barack Obama and former President George W Bush attended the first ceremony, at the site of the World Trade Center in New York.

Nia Evans, who lost a friend at the World Trade Center, observes a moment of silence during ceremonies at the World Trade Center site

Mourners filed into a new memorial at Ground Zero, on which the names of the dead are engraved.

US President Barack Obama (R) addresses the crowd as first lady Michelle Obama with former US President George W Bush and former first lady Laura Bush (L) listen

President Obama read from the Bible, a passage from Psalm 46, which speaks of God's refuge and strength, "a very present help in trouble".

US. President Barack Obama and first lady, Michelle Obama look on as military personal place a wreath in Shanksville, Pennsylvania,

Accompanied by his wife Michelle, he then travelled on to Pennsylvania, where the couple laid a wreath of white flowers at the site where the fourth plane was forced down in a Shanksville field by passengers who fought back against the hijackers.

New York Police Department officers patrol at the World Trade Center site in New York

Security was tight following warnings of a possible al-Qaeda attack.

Members of the New York City Police Department stand near the World Trade Center site on the morning of September 11, 2001 in New York City.

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.

A person holds up a sign showing a New York firefighter during ceremonies marking the 10th anniversary of the 9/11 attacks on the World Trade Center, in New York

As on previous anniversaries, the names of all the victims were read out at the site of the World Trade Center.

A police officer's white gloved hand searches for a name on the wall around the North pool of the 9.11 Memorial during tenth anniversary ceremonies at the site of the World Trade Center September 11, 2011, in New York

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 memorial pools at Ground Zero.

Relatives of victims also gathered in Washington and Pennsylvania, where hijacked planes also crashed on 9/11.

Chairman of the Joint Chiefs of Staff Admiral Mike Mullen (L), Defense Secretary Leon Panetta and Vice President Joe Biden hold their hands over their hearts during the U.S. national anthem

In a speech at the Pentagon, Vice-President Joe Biden commended America's armed forces for their service and their sacrifices since the attacks.

The Tribute in Lights is illuminated next to the Statue of Liberty (C) and One World Trade Center (L) during events marking the 10th anniversary of the 9/11 attacks on the World Trade Center in New York, September 10

In the early hours of Sunday the Tribute in Lights was illuminated next to the Statue of Liberty and the One World Trade Center.

In Pictures

In pictures: 9/11 anniversary

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