23 years on: How the 9/11 attacks unfolded minute-by-minute
A total of 2977 people were killed after hijackers took control of four US commercial airplanes and crashed them into multiple targets.
terrorismGlobal terror group Al Qaeda was formed in 1988 by Osama bin Laden, the now deceased mastermind of the 9/11 attacks on New York's World Trade Centre and bombings of other Western targets. The militant Sunni Islamist terror organisation has a strong presence in Afghanistan, the Middle East, and west and east Africa.