Today marks 18 years of the horrific terrorist attacks that happened in the United States of America. 9/11 attacks were a series of four coordinated suicide attacks that took place on September 11, 2001.

The attacks killed nearly 3,000 people and injured over 6,000 others. The 9/11 attacks were the deadliest on the US soil since the Pearl Harbour bombing in 1941 that launched the US into World War II.

Here are the never seen before pictures of the horrific incident.