How to watch 9/11 memorial events as U.S. marks 25th anniversary

Key Points:

• The 25th anniversary of the 9/11 attacks will be commemorated nationwide, with notable ceremonies at the National September 11 Memorial and Museum in New York, the Pentagon Memorial in Arlington, Virginia, and the Flight 93 National Memorial in Shanksville, Pennsylvania.
• For the first time, the New York memorial will observe a seventh moment of silence honoring those who have died from illnesses linked to the attacks, in addition to the traditional six silences marking key moments of the events.
• President Donald Trump is expected to speak at the Pentagon ceremony, which includes a reading of victims' names, while four former presidents and Hillary Clinton plan to attend the Ground Zero event in New York.
• The Pentagon Memorial has been designated as an "Affiliated Area of the National Park System" and will soon begin construction on a $35 million visitor education center, scheduled to open in 2029.
• PBS News is marking the anniversary with special coverage, including reflections on the ongoing impact of 9/11, archival poetry readings, and live streams of the commemorative events.