Episode Details

Twenty-five years after the September 11 attacks, New York City is once again arguing over what 9/11 means. On September 11, 2001, 19 al-Qaeda hijackers seized four passenger planes, killing nearly 3,000 people in New York, at the Pentagon and in Pennsylvania. Yet questions and conspiracy theories about the Twin Towers, World Trade Center 7, the Pentagon and possible failures before the attacks have survived for decades.

Now 9/11 is at the center of another controversy. More than 100,000 people have signed a petition asking organizers to reconsider New York Mayor Zohran Mamdani's presence at the 25th-anniversary ceremony, while other victims' families defend his participation. What happened on 9/11, which mysteries are genuine, which theories don't match the evidence, and why has America's most infamous terrorist attack become politically explosive again?