New York Mayor Zohran Mamdani announced on Tuesday the release of tens of thousands of documents showing the city did not disclose all it knew about air toxicity after 9/11. The release comes ahead of the 25th anniversary of the September 11, 2001, attacks that killed 2,977 people in the United States, mostly in the collapse of the Twin Towers in New York. In the years since, more than 9,400 have died from illnesses linked to their exposure to the area, according to a federal medical monitoring program.