2,977 people were killed when Al Qaeda hijackers seized four planes and flew them into the Twin Towers of the World Trade Centre in New York and the Pentagon in Washington.

For a quarter century, the US has drone-struck weddings, abducted and tortured people at black sites and blown up fishermen, spreading terror in the name of fighting it

Two of the hijacked planes struck the Twin Towers in New York and a third crashed into the Pentagon. | World News

The 2001 attacks unfolded across New York, Virginia, and Pennsylvania, killing nearly 3,000 people and permanently changing American life.