With the exception of the Civil War battle of Antietam, more American lives were lost on September 11, 2001, than on any other day in U.S. history: 2,996 people were killed—265 on the four hijacked planes, 125 at the Pentagon and 2,606 at the World Trade Center and surrounding area. More than 411 emergency workers died on 9/11.
The Attack 9/11 2001
American Police News 