With moments of silence punctuated by somber music, readings of names, and tears, Americans held solemn memorial services Thursday to honor the victims of the September 11, 2001, terrorist attacks.

Former Defense Secretary Donald Rumsfeld returned to the Pentagon to help dedicate a memorial to victims of the attack there.

"Today we renew our vows to never forget how this long struggle began and to never forget those who fell first," said Rumsfeld, who despite his high office helped carry the wounded from the burning building seven years ago.