Large crowds gathered in New York at the memorial where the twin towers of the World Trade Center stood and where thousands of people died 16 years ago.
It was one of many events taking place across the United States to commemorate the anniversary of the 9/11 attacks.
Relatives of victims, survivors and rescuers observed a moment’s silence at exactly 8-46 to publicly mark the time that the first plane hit the north tower.
It was President Donald Trump’s first commemoration of September 11th and, after an event at the White House, he and first lady Melania attended a remembrance event at the Pentagon.
Nearly 3,000 people died in 2001 when hijackers crashed planes into the World Trade Center in New York, the Pentagon and a field in Pennsylvania.