5)World Trade Center Bombing of 1993
World Trade Center had come under attacks much before the 9/11 massacre. The first attack took place on 26th February, 1993. However, the attacks could not bring down the twin towers. In essence, the attack failed. A group, which included Ahmad Ajaj, Mahmud Abouhalima, Nidal A. Ayyad, Ramzi Yousef, Abdul Rahman and Mohammad Salameh, planned this attack. It was also found that the attack was financed by Shaikh Mohammed.