Watch Video | When New York's Twin Towers were razed during 9/11 terror attacks

One still shivers while remembering the September 11, 2001 attacks on twin towers of World Trade Centre in Manhattan, New York. The visuals of 2 airplanes deliberately colliding with the twin towers shook not only the United States but the entire world.

A total of 2,996 people were killed in the attacks, which were the deadliest in human history, with more than 25,000 injured.

9/11 attacks that took place on September 11, 2001 was a series of four coordinated terrorist attacks carried out by the Al Qaeda terror group. Four commercial planes were hijacked by 19 Al Qaeda terrorists and were set up to target important American buildings.

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The first plane to hit its target was the American Airlines Flight 11. It was flown into the North Tower of the World Trade Center complex in Lower Manhattan. Both 110-story towers collapsed within an hour and 42 minutes, leading to the collapse of the other World Trade Center structures and damaging surrounding buildings.

The third plane, American Airlines Flight 77, crashed into the west side of the Pentagon causing a partial collapse of the building's side. The fourth jet, United Airlines Flight 93 which was flown in the direction of Washington, D.C., was the only one not to hit its intended target, as it crashed in a field near Shanksville, Pennsylvania.

It was later found that Flight 93's target was either the White House or the Capitol.