The US flag was unfurled from the roof of the Pentagon today to mark 22 years since the 9/11 terror attacks.

19 terrorists hijacked four planes, crashing into the Pentagon, the World Trade Center, and a field in Shanksville, Pennsylvania, on September 11, 2001. The incident took the lives of nearly 3,000 people.

“LIVE: An American flag is unfurled at the National #September11 Pentagon Memorial near where @AmericanAir Flight 77 hit the building and killed 184 people there 22 years ago. We will #NeverForget,” The US Army tweeted.

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On Sunday, a “bell of hope” is scheduled to ring in New York City to mark the exact moment when the first of two planes hit the World Trade Center towers.

When passenger jets hijacked by al-Qaida terrorists struck the Twin Towers in New York and the Pentagon outside Washington, a total of 2,977 people were killed. A fourth hijacked plane crashed into a field in Pennsylvania. Over 400 first responders were killed in the aftermath of the collapse.

First Lady Jill Biden visited the National 9/11 Pentagon Memorial to lay a wreath and Defense Secretary Lloyd Austin was also in attendance in Arlington. Vice President Kamala Harris is scheduled to attend a 9/11 Ground Zero Memorial Service in New York City.

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On Tuesday, 184 people were killed when American Airlines Flight 77 was brought down. 64 people died on the ill-fated plane and 125 people died in the Pentagon.

“The events of that day, 22 years ago, and in the days and years that followed prove that our shared humanity is mightier than any force that seeks to divide us. In this era of global challenges, let the memory of 911 be a beacon, reminding us that we are stronger than the sum of our parts,” said Admiral Christopher Grady, 12th Vice Chairman of the Joint Chiefs of Staff. “This anniversary has become a symbol of hope by uniting the goodwill and good deeds of the nation.”