The 9/11 attacks happened on Tuesday, September 11, 2001. On that day, hijackers seized four US passenger planes and crashed them into major targets: two into the Twin Towers of the World Trade Center in New York City, one into the Pentagon near Washington, DC, and the fourth crashed in a field in Pennsylvania after passengers attempted to retake control of the plane. These attacks caused massive destruction and loss of life, killing nearly 3,000 people, and marked a pivotal moment in global history.