US military personnel fold a flag as they take part in a memorial ceremony in honour of the 15th anniversary of the September 11, 2001 attacks on New York and Washington DC, at the International Security Assistance Force (ISAF) headquarters in Kabul on September 11, 2016. PHOTO: AFP
US presidential candidates Hillary Clinton and Donald Trump temporarily paused their bitter election campaign to attend the service with police and relatives of the victims at the September 11 memorial.
The moments of silence was observed at 8:46 am (1246 GMT) -- the time when the first hijacked passenger jet hit the North Tower of the World Trade Center. It was the first of six moments of silence that will be observed in the Big Apple.
Ceremonies were also planned at the Pentagon, where another jet struck.
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