A firefighter breaks down as the World Trade Centre buildings collapsed on September 11, 2001, after two hijacked airplanes slammed into the twin towers in a terrorist attack. AFP
A hijacked commercial plane approaches the World Trade Centre shortly before crashing into the landmark skyscraper in New York on September 11, 2001. AFP
The South Tower of the World Trade Centre collapses sending dust and smoke into the streets in New York on September 11, 2001. Two planes crashed into the towers that later collapsed. AFP
A bird takes flight over the wreckage of the World Trade Centre on September 16, 2001, as clearing work continued on the site of the nation's worst terrorist attack. AFP
George W Bush, then US president, reacts after being told about the terrorist attack on September 11, 2001.
A hijacked United Airlines Flight 175 plane flies towards the World Trade Centre twin towers shortly before slamming into the south tower, as the north tower burns following an earlier attack in New York on September 11, 2001. Reuters
People run away as the second tower of World Trade Centre crumbles down after a plane hit the building on September 11, 2001, in New York. AFP
Firefighters and emergency workers battle fires as they search for survivors amid the debris of the World Trade Centre in New York on September 13, 2001. AFP
Firefighters make their way through the rubble of the World Trade Centre on September 11, 2001, in New York, after two hijacked planes flew into the skyscrapers. AFP
Smoke and flames billow out of the World Trade Centre towers before their collapse on September 11, 2001, in New York. AFP
An American flag is posted in the rubble of the World Trade Centre on September 13, 2001, in New York. The search for survivors and the recovery of the victims continued in the days following the September 11 terrorist attack. AFP
People walk in the street in the area where the World Trade Centre buildings collapsed on September 11, 2001, after two planes slammed into the twin towers in what was then a 'suspected' terrorist attack. AFP
A plane hijacked by terrorists from Boston crashes into the South Tower of the World Trade Centre on September 11, 200,1 in New York. AFP
A man falls to his death from the World Trade Centre after two planes hit the building on September 11, 2001, in New York. AFP
A firefighter breaks down as the World Trade Centre buildings collapsed on September 11, 2001, after two hijacked airplanes slammed into the twin towers in a terrorist attack. AFP
A hijacked commercial plane approaches the World Trade Centre shortly before crashing into the landmark skyscraper in New York on September 11, 2001. AFP
The South Tower of the World Trade Centre collapses sending dust and smoke into the streets in New York on September 11, 2001. Two planes crashed into the towers that later collapsed. AFP
A bird takes flight over the wreckage of the World Trade Centre on September 16, 2001, as clearing work continued on the site of the nation's worst terrorist attack. AFP
George W Bush, then US president, reacts after being told about the terrorist attack on September 11, 2001.
A hijacked United Airlines Flight 175 plane flies towards the World Trade Centre twin towers shortly before slamming into the south tower, as the north tower burns following an earlier attack in New York on September 11, 2001. Reuters
People run away as the second tower of World Trade Centre crumbles down after a plane hit the building on September 11, 2001, in New York. AFP
Firefighters and emergency workers battle fires as they search for survivors amid the debris of the World Trade Centre in New York on September 13, 2001. AFP
Firefighters make their way through the rubble of the World Trade Centre on September 11, 2001, in New York, after two hijacked planes flew into the skyscrapers. AFP
Smoke and flames billow out of the World Trade Centre towers before their collapse on September 11, 2001, in New York. AFP
An American flag is posted in the rubble of the World Trade Centre on September 13, 2001, in New York. The search for survivors and the recovery of the victims continued in the days following the September 11 terrorist attack. AFP
People walk in the street in the area where the World Trade Centre buildings collapsed on September 11, 2001, after two planes slammed into the twin towers in what was then a 'suspected' terrorist attack. AFP
A plane hijacked by terrorists from Boston crashes into the South Tower of the World Trade Centre on September 11, 200,1 in New York. AFP
A man falls to his death from the World Trade Centre after two planes hit the building on September 11, 2001, in New York. AFP
A firefighter breaks down as the World Trade Centre buildings collapsed on September 11, 2001, after two hijacked airplanes slammed into the twin towers in a terrorist attack. AFP