Sept. 11: A Day of Remembrance

President Barack Obama and first lady Michelle Obama lay a wreath as the 10th anniversary of the September 11 attacks are observed at the Pentagon in Washington, Sunday, Sept. 11, 2011. At right is Chairman of the Joint Chiefs of Staff Adm. Mike Mullen. (AP Photo/Charles Dharapak)
September 11, 2011 5:49:39 PM PDT