Live: Flight 93 National Memorial in Pennsylvania marks 25 years since 9/11 attacks

Friday marks 25 years since nearly 3,000 people were killed as 19 al-Qaeda hijackers seized control of four jetliners on Sept. 11, 2001. Two planes were flown into the World Trade Center, one into the Pentagon and a fourth into a field in Shanksville, Pennsylvania. Ceremonies are being held at 9/11 memorials across the United States, including at the attack sites in New York, Washington, D.C., and Shanksville. The observance at the Flight 93 National Memorial commemorates the time when passengers and crew members aboard Flight 93 took action to disrupt the hijackers' plans to fly the plane into a federal building in Washington. Forty passengers and crew members were killed. Flight 93 National Memorial observance At the Flight 93 Memorial in Shanksville, two ceremonies are planned to honor the thousands of lives lost. The morning observance began at 8:30 a.m. ET at the Wall of Names, where officials will read the names of the 40 passengers and crew members killed on Flight 93. The Bells of Remembrance will ring in their honor. At 1 p.m. ET, a second ceremony will take place at the Wall of Names, featuring keynote speakers, including Pennsylvania Gov. Josh Shapiro, who will pay tribute to the lives lost. The ceremony will conclude with a wreath-laying event. After both ceremonies, the Wall of Names will open to the public.