25 Years After 9/11: Tracing The Rise And Fall Of al Qaeda

25 years after 9/11, the terrorist group al-Qaeda is no longer the global terrorist organization it once was. Its central leadership has been weakened, but offshoots remain strong across Africa and Asia.

While it has suffered setbacks, notably bin Laden's killing in 2011 by US forces and the emergence of Islamic State as a rival, experts say al Qaeda still serves as a source of support and inspiration for militants in many regions, particularly in Africa.