What is 9/11 terror attack?

September 11, 2001 attacks, widely known as 9/11 terror attack is regarded as one of the deadliest terrorist attacks in the history of the United States, killing thousands of Americans.

 

19 militants associated with the Islamic terrorist group, al-Qaeda hijacked four commercial planes and crashed two of them into the upper floors of the North and South Towers of the World Trade Centre complex, ultimately causing them to collapse.

 

A third plane crashed into the Pentagon in Arlington, Virginia. The fourth plane, which was aiming to hit White House or Capitol building crashed into an empty