Observers stand under an American flag flying at half mast above the site of the former twin World Trade Center towers in New York

 
Observers stand under an American flag flying at half mast above the site of the former twin World Trade Center towers in New York
Observers stand under an American flag flying at half mast above the site of the former twin World Trade Center towers in New York while family members of victims pay their respects at Ground Zero September 11, 2007 on the sixth anniversary of the Sept. 11 attacks. REUTERS/Lucas Jackson (UNITED STATES)