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As David and Samantha Cameron were visiting Ground Zero on the final day of their tour of the US, she was heard to say that, "the memories of that day will stay with me forever".
She said: "I just couldn't believe it had happened and to see the aftermath and the effect on the city was just so shocking.
"I often think about the people who died and their families - I am glad I have been able to come and pay my respects properly today."
Charles Wolf - whose wife Katherine died during the September 11 attacks - said it was "a great honour" to meet David and Samantha Cameron when the couple visited Ground Zero.
David and Samantha Cameron have arrived at the site of Ground Zero in New York on the last day of their visit to America.
Shami Chakrabarti, director of Liberty has said she was pleased to hear that the Prime Minister has put "extradition on the agenda" in his visit to the US. Ms Chakrabarti said:
" [David Cameron's] comments about a further review will give hope, not just to Gary McKinnon but to families across the UK increasingly concerned by the injustices of instant extradition without evidence, compassion or common sense".
The Prime Minister and US President Barack Obama have agreed to review the operation of a controversial extradition treaty, allowing more Britons facing extradition to the US to be tried in UK courts.
Latest ITV News reports
The Prime Minister has said he had been "bowled over" by the warmth and reception he received from US President Barack Obama.