Commemorations in NY begin at 8:46 a.m. ET with a citywide moment of silence marking the moment the first plane hit the World Trade Center's North Tower.
On the 16th anniversary of 9/11, the USA government has released rare pictures that reveal the horror inside the building after it was hit by a American Airlines Flight 77.
A bell is tolling to mark the moment when the north tower of the World Trade Center collapsed on September 11, 2001.
Family and friends will gather to commemorate and honour the near 3,000 people that were killed on September 11, 2001.
Three out of the five buildings, including One, Four and Seven World Trade, are now open and occupied with residents and businesses alike. The White House claimed that he will be joined by the first lady Melania Trump.
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President Donald Trump says during a 9/11 ceremony at the Pentagon that the nation grieves for the people "who were murdered by terrorists" 16 years ago. Defense Secretary Jim Mattis and General Joseph Dunford, chairman of the Joint Chiefs of Staff, are hosting a private observance for victims' relatives there at 9.11am local time.
A ceremony is planned at the 9-11 Remembrance Garden today at 4:55 p.m.
After the names are read out at that ceremony, there will be a public observance with a wreath-laying and public addresses.
American Airlines Flight 11 and United Airlines Flight 175 were flown into the North and South towers of the World Trade Center complex in New York City.