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 programme. "These are documents that show what the city knew about the toxic air around Ground Zero, when they knew it, and how they acted to limit liability," the mayor told a news conference following the online release of 170,000 pages of documents on health concerns, air quality and the city's r...