The commemoration of the 17th anniversary of the Sept. 11 terror attacks began at the World Trade Center in New York with a moment of silence and tolling bells.
Victims' relatives, survivors, rescuers and dignitaries were gathered on the memorial plaza where the twin towers once stood as the ceremony started at 8:46 a.m. That is the time when a hijacked plane slammed into the World Trade Center's north tower.
Then victims' loved ones began reading the names of the nearly 3,000 people killed when four hijacked planes crashed into the trade center, the Pentagon and a Pennsylvania field on Sept. 11, 2001.
President Donald Trump and first lady Melania Trump are at the 9/11 memorial near Shanksville, Pennsylvania.
Vice President Mike Pence is attending a ceremony at the Pentagon.
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