On September 11, 2001, NYPD helicopters flew around the Twin Towers searching for survivors on the rooftops. They hoped to rescue people trapped above the fire, but intense smoke, extreme heat, and locked roof doors made it impossible. Pilots couldn’t land or hover safely due to poor visibility and dangerous conditions. No rooftop rescues happened that day, despite their best efforts. The footage from that mission remains one of the most haunting scenes from 9/11. 🕊️ | History In Pictures

Multiple firsthand reports from 9/11 survivors, firefighters, and emergency personnel describe secondary explosions occurring both before and after the collapse of the Twin Towers. Firefighters at the scene recalled hearing loud, successive booms inside the buildings, which some likened to controlled demolition charges. Other first responders noted that explosions seemed to emanate from lower levels, distinct from the initial plane impacts. Civilians inside and around the buildings also reported