NYC pauses to remember 9/11 victims 23 years after terror attacks ...

First responders battling 9/11-related illnesses honored at NYC pizzerias 02:27

NEW YORK -- Today marks 23 years since the Sept. 11, 2001 terror attacks that forever changed New York City and the nation. 

Nearly 3,000 people were killed when al Qaida hijackers crashed four jetliners into the twin towers, the Pentagon and a field in southwest Pennsylvania. 

On this day every morning for the past 23 years, families who lost loved ones in the worst terror attack on American soil make the solemn trek to ground zero to observe the six moments of silence, hear the reading of the names, and fulfill a sacred promise to never forget. 

As years pass, more and more names are being read by children and young adults born after the attacks - as an older generation passes on the grave responsibility of remembering this day to a new generation. 

Watch the solemn remembrance at the 9/11 Memorial & Museum streaming live on CBS News New York starting at 8:25 a.m. 

9/11 moments of silence

Wednesday's ceremony honors the victims killed in the 2001 attacks on the World Trade Center, the Pentagon, aboard Flight 93 and in the 1993 WTC bombing. 

The 9/11 Memorial & Museum opens to family members at 8:00 a.m. before the commemoration begins at 8:46 a.m.

A citywide moment of silence will be held at 8:46 a.m. to mark the moment hijacked Flight 11 struck the North Tower. A second moment of silence will be held at 9:03 a.m. to mark when hijacked Flight 175 struck the South Tower. 

Another moment of silence follows at 9:37 a.m., marking when hijacked Flight 77 struck the Pentagon.

A moment of silence will be held at 9:59 a.m. to mark when the South Tower fell, then at 10:03 a.m. to mark when hijacked Flight 93 crashed in Shanksville, Pennsylvania, and then at 10:28 a.m. to mark when the North Tower fell. 

The ceremony typically concludes around 12:30 p.m.

U.S. leaders expected to attend

President Joe Biden and Vice President Kamala Harris are expected to be on hand for the memorial in Lower Manhattan. Republican Vice Presidential nominee JD Vance is also in the city to mark 9/11.

The White House says Mr. Biden and Harris will also appear at the 9/11 sites in Shanksville, Pennsylvania and the Pentagon in Arlington, Virginia. 

Street closures for 9/11 ceremony

The 9/11 Memorial & Museum is located at the World Trade Center in Lower Manhattan. 

Drivers should plan for the following street closures around the area:

Areas bounded by Barclay Street on the North; Rector Street on the South; Broadway on the East; West Street on the West (All Inclusive)Liberty Street between West Street and South End AvenueAlbany Street between West Street and South End AvenueWest Thames Street between West Street and South End AvenueSouth End Avenue between Liberty Street and West Thames StreetBattery Place between West Thames Street and 3rd Place3rd Place between Battery Place and Little West StreetLittle West Street between 3rd Place and Battery Place

This comes the same time as the United Nations General Assembly, which is also causing street closures and delays on Manhattan's East Side. 

In: Manhattan New York City 9/11