EE.UU. conmemora el 10º aniversario del 11-S
US Army soldiers stand with their heads bowed to commemorate the 10th anniversary of the September 11 attacks on New York and Washington, at a ceremony at Jalalabad army base in Afghanistan on September 11, 2011. A jittery, embattled United States comes together in grief on the 10th anniversary of the 9/11 attacks which killed almost 3,000 people and plunged it into an era of war and bitter internal division. AFP PHOTO / TAUSEEF MUSTAFA
U.S. President Barack Obama (behind glass, center L) delivers remarks as first lady Michelle Obama, former President George W. Bush and former first lady Laura Bush (R-L) look on during ceremonies marking the 10th anniversary of the 9/11 attacks on the World Trade Center, in New York, September 11, 2011. REUTERS/Larry Downing (UNITED STATES - Tags: ANNIVERSARY DISASTER)
A singer performs during the start of the ceremonies marking the 10th anniversary of the 9/11 attacks on the World Trade Center, in New York September 11, 2011. REUTERS/Gary Hershorn (UNITED STATES - Tags: ANNIVERSARY DISASTER)