It's an very upset incident on September 11, 2001, 19 militants associated with the Islamic extremist group al Qaeda hijacked four airplanes.
The terrorists carried out suicide attacks against different targets in the United States.
Two of the planes were hit the twin towers of the World Trade Center in New York City.
Third plane hit the Pentagon in Arlington, Virginia, just outside Washington, D.C.
Fourth plane crashed in a field in Shanksville, Pennsylvania.
How many people killed during 9/11 attack? Around 3,000 people were killed during the 9/11 terrorist attacks.
Who is responsible for 9/11 terrorist attack? Reportedly the Islamist terrorist are financed by the al Qaeda terrorist organization of Saudi fugitive Osama bin Laden.
The terrorists were allegedly acting in retaliation for America’s support of Israel, its involvement in the Persian Gulf War and its continued military presence in the Middle East.
Did you know from where the Planes Take Off From?
The 19 terrorists carried knives & other weapons with them illegally and entered the three East Coast airports.
Three airports are Logan International Airport in Boston, Dulles International Airport in Washington, D.C. and Newark International Airport in New Jersey.
The terrorists boarded at 4 A.M early-morning flights bound for California.
They choose these planes because they knew that these planes will be loaded with fuel for the very long journey.
Soon after takeoff, the terrorists take the 4 planes under control with them, transforming ordinary passenger jets into guided missiles.