9/11 Anniversary: US Vice President Kamala Harris attends memorial in New York

The visuals of passenger planes slicing through the Twin Towers of the World Trade Center are etched in public memory as today marks 22 years since 9/11 the al-Qaeda-led terror attacks in New York City. On this day four hijacked jetliners crashed in the World Trade Center, the Pentagon and a field in Pennsylvania killing nearly 3, 000 people and changing the course of history for the next two decades take a look.