What to KnowNearly 3,000 people died on Sept. 11, 2001, when Islamic terrorists hijacked four U.S. commercial planes and flew directly into the lifeblood of our nation. It was the deadliest terror attack in history.The vast majority of those victims came from lower Manhattan; nearly 2,800 people die d when two jets crashed into the World Trade Center’s Twin Towers. Both collapsed.When the first plane hit, an estimated 17,400 people were in the two towers. No one survived above the impact zone in the North Tower; 18 above the South’s escaped.6 moments of silence are traditionally observed on the anniversary. 4 mark the moment each hijacked flight crashed, and 2 mark the towers’ collapses. This year, a 7th moment of silence memorializes those who lost their lives to 9/11-related health issues.The WTC Health Program says 9,000+ people have died from related health problems, triple the casualties from the attacks.Those after-effects jumped front and center this week when the city released 170K pages of never-before-public documents suggesting officials knew of air quality risks. Twenty-five years ago today, Islamic extremists hijacked four U.S. commercial airplanes in the name of al-Qaida, flying two into the soaring towers of the World Trade Center, one into the Pentagon, and crashing one in a Pennsylvania field amid a heroic passenger rebellion. The events of Sept. 11, 2001, marked the deadliest terror attacks in history, killing nearly 3,000 people. More than 3/4 of the victims died amid the disaster in lower Manhattan. Decades later, 9/11’s legacy continues to claim lives. Today and always, we remember them. Follow our live blog below. ...read more read less