Global war on terror rages as ISIS, al Qaeda expand 23 years after 9/11

Its been 23 years since al Qaeda hit the U.S. in the deadliest terrorist attack in history and sparked the Global War on Terror, though terrorism remains a major security threat across the globe.

Caitlin McFall is a Reporter at Fox News Digital covering Politics, U.S. and World news.

The plan, outlined by al Qaeda leader Osama bin Laden, killed 2,977 victims 23 years ago in what remains the largest terrorist attack in history and set in motion a global fight against extremism.

But despite the end to the U.S. war in Afghanistan and declared defeat over Islamic terrorist organizations like al Qaeda and the Islamic State, experts warn the threat posed by extremist groups remains acute to this day.