US commemorates 9/11; thousands expected at ground zero

Time heals all wounds but the world will never forget the horror of 9/11

They also rang out to mark other significant timings during that destructive day in 2001, including the moment the south tower collapsed in NY. Loved ones read the names of each person killed in the attacks, many holding back tears as they talked about those who died. The commemoration is for family members of victims of the 2001 and 1993 attacks, and they have been invited to participate in this year's reading of the names.

Monday marks the 16th anniversary of the harrowing day 2,996 died and more than 6,000 others were injured when two planes crashed into the World Trade Center.

At least 1,000 family members, survivors, rescuers and officials were gathered as the ceremony at the World Trade Center began with a moment of silence and tolling bells.

The White House says Trump and first lady Melania Trump will observe a moment of silence Monday morning in remembrance of the lives that were lost. Four hijacked planes hit the trade center towers and the Pentagon, and crashed in a Pennsylvania field.

At a Pentagon ceremony, President Donald Trump said the nation grieves for the victims, and when America is united "no force on earth can break us apart".

Vice President Mike Pence is delivering remarks at a ceremony at the Flight 93 National Memorial near Shanksville.

GettyThe al-Qaeda terrorists who carried out the attacks. Some of his recollections have raised eyebrows, particularly remarks while talking about Muslims that "thousands of people were cheering" in Jersey City, New Jersey, as the towers fell.

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