The terror attack in 2001 on one of the then iconic sites in New York, the World Trade Centre, shook the United States and had a huge impact globally.
"Nineteen years ago, under clear blue skies, 102 minutes changed our lives forever. On Friday, September 11, we lead the nation and the world in observing the 19th anniversary of the 2001 attacks and ask you to join us in commemorating," 9/11 Memorial & Museum posted on Twitter.
9/11 attacks were one of the worst in history, which killed 3,000 Americans and others from different countries. Over 6,000 people were injured.
The 9/11 Tribute in Light shines above the lower Manhattan skyline in New York City. The National September 11 Memorial & Museum’s annual Tribute in Light was initially cancelled this year due to the coronavirus pandemic. However, New York Governor Andrew Cuomo reversed this decision, announcing that the state will provide health personnel and supervision to maintain the light installation. Photograph: Michael M Santiago/Getty Images
The double beams of light evoke the fallen twin towers in New York City. Photograph: Michael M Santiago/Getty Images
People visit the light tribute to the 9/11 attacks on the Pentagon in Arlington, Virginia. The display is part of a scaled back commemoration this year due to the coronavirus pandemic. Photograph: Tasos Katopodis/Getty Images
The tower of light is provided by a private organisation, the Tunnel to Towers Foundation, which was started in honour of New York City firefighter Stephen Gerard Siller, who was killed responding to the attacks on the World Trade Center. Photograph: Tasos Katopodis/Getty Images