Live stream: America remembers 9/11 on 20th anniversary

Watch live coverage of Sept. 11 anniversary ceremonies in New York City, Shanksville, Pa., and outside Washington, D.C., at the Pentagon.

President Biden will visit all three memorial sites.

Watch live beginning at 8:30 a.m. Saturday:

9/11 -- 20 years later

• 20th anniversary of terrorist attacks marked by NY teams
• Now president, Biden to mark 9/11 rite amid new terror fear
• Ground zero: A selfie stop for some, a cemetery for others
• Flight attendant describes waking up in NYC on 9/11: ‘We saw the North Tower collapse through the window’
• A key rescue on 9/11: How a janitor at the World Trade Center used this tool to save lives
• Remember what the Trade Center looked like, pre-9/11? This 360-degree view will show you
• 20 years later, fallout from toxic WTC dust cloud grows