Al-Qaeda was for many years the main terrorist movement leading the ideology of extremist Islam. Founded in 1988 by Osama Bin Laden, it was initially known as a group within the anti-Soviet Islamist front in Afghanistan. Later in its history however it turned into an international network of terror, capable of carrying out jihadist attacks around the world. His name is tied to the attack against the World Trade Center in New York in 1993. Following this al-Qaeda claimed further attacks against US posts in Africa and Yemen. But the most infamous attack is the one on September 11 2001, where numerous airplanes were hijacked and flown into the Twin Towers in New York and the Pentagon in Washington. Following the killing of Bin Laden in 2011, the head of al-Qaeda is now the Egyptian Ayman al-Zawāhiri. In the last few years al-Qaeda, in the Islamic world, has lost ground in favour of al-Baghdadi’s Isis.