For the 20th time, America is pausing to read the names of and remember the nearly 3,000 people killed in the Sept. 11 attacks that stunned and forever changed the nation. In New York City, at the Pentagon and outside Shanksville, Pennsylvania, ceremonies to remember the attacks that occurred there 20 years ago are being held Saturday. At the 9/11 Memorial in New York City, a solemn crowd of hundreds gathered as a bell tolled and a moment of silence was held at 8:46 a.m., the moment the north tower of the World Trade Center was hit 20 years ago.