NEW : Former defense contractors donated money for memorial . ' On a day when buildings fell , we rose , ' president says . Relatives then began to read the names of the 2,751 victims at the crash site , commonly called ground zero . Day ' began like any other and ended as none ever has , ' New York mayor says . Watch 9/11 memorials in New York and Washington on CNN.com Live .
NEW : Former defense contractors donated money for memorial . ' On a day when buildings fell , we rose , ' president says . Day ' began like any other and ended as none ever has , ' New York mayor says . Watch 9/11 memorials in New York and Washington on CNN.com Live .