Here, just released, are some of the remarkable photos of the 11 September 2001 attacks taken by a New York police helicopter pilot as he searched for survivors. The images were published following a Freedom of Information request by ABC News last year.
Smoke and ash engulf office blocks after the collapse of the first tower. On Thursday a new study found that those who were exposed to fumes and dust following the attacks are still suffering headaches more than eight years on.
Hundreds of emergency workers rush towards the site of the collapse.
Smoke billows from one of the twin towers.
The devastation as seen from across the Upper Bay, in New Jersey.
The two buildings collapsed within half an hour of each other.
Two thousand, seven hundred and fifty-two people (other than the attackers) died in the assault on the twin towers.
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