President Obama leading a minute silence
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President Obama lays wreath at Ground Zero

US President Barack Obama is visiting Ground Zero, the site of the 9/11 attacks in New York, four days after US forces killed al-Qaeda head Osama Bin Laden in Pakistan.

Bin Laden was believed to be the mastermind of the 9/11 attacks in 2001.

Mr Obama laid a wreath in memory of the nearly 3,000 victims and spoke to relatives at the site.

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