Maryland News Remembering 9/11 September 11, 2011 / 10:14 PM EDT / CBS News MLADEN ANTONOV/AFP/Getty Images New York City Commemorates 10th Anniversary Of 9-11 Terror Attacks Photo by Allan Tannenbaum-Pool/Getty Images Obama Marks 10th Anniversary Of 9/11 Attacks At The Flight 93 National Memorial Photo by Jeff Swensen/Getty Images New York City Commemorates 10th Anniversary Of 9-11 Terror Attacks Photo by Spencer Platt/Getty Images US President Barack Obama and First Lady MANDEL NGAN/AFP/Getty Images New York City Commemorates 10th Anniversary Of 9-11 Terror Attacks Photo by Allan Tannenbaum-Pool/Getty Images New York City Commemorates 10th Anniversary Of 9-11 Terror Attacks Photo by Allan Tannenbaum-Pool/Getty Images New York City Commemorates 10th Anniversary Of 9-11 Terror Attacks Photo by Allan Tannenbaum-Pool/Getty Images New York City Fire Fighters Commemorate 10th Anniversary Of Sept. 11th Attacks Photo by Mario Tama/Getty Images New York City Commemorates 10th Anniversary Of 9-11 Terror Attacks Photo by Allan Tannenbaum-Pool/Getty Images New York City Commemorates 10th Anniversary Of 9-11 Terror Attacks Photo by Allan Tannenbaum-Pool/Getty Images New York City Commemorates 10th Anniversary Of 9-11 Terror Attacks Photo by Allan Tannenbaum-Pool/Getty Images New York City Commemorates 10th Anniversary Of 9-11 Terror Attacks Photo by Allan Tannenbaum-Pool/Getty Images Anniversary of Sept. 11th Attacks Marked At Pentagon Photographer: Joshua Roberts/SIPA New York City Commemorates 10th Anniversary Of 9-11 Terror Attacks Photo by Allan Tannenbaum-Pool/Getty Images Remembering 9/11 MLADEN ANTONOV/AFP/Getty Images New York City Commemorates 10th Anniversary Of 9-11 Terror Attacks Photo by Allan Tannenbaum-Pool/Getty Images Anniversary of Sept. 11th Attacks Marked At Pentagon Photographer: Joshua Roberts/SIPA Remembering 9/11 MLADEN ANTONOV/AFP/Getty Images Anniversary of Sept. 11th Attacks Marked At Pentagon Photographer: Joshua Roberts/SIPA Anniversary of Sept. 11th Attacks Marked At Pentagon Photo by Joshua Roberts-Pool/Getty Images Anniversary of Sept. 11th Attacks Marked At Pentagon Photo by Joshua Roberts-Pool/Getty Images New York City Commemorates 10th Anniversary Of 9-11 Terror Attacks New York City Commemorates 10th Anniversary Of 9-11 Terror Attacks New York City Commemorates 10th Anniversary Of 9-11 Terror Attacks New York City Commemorates 10th Anniversary Of 9-11 Terror Attacks New York City Commemorates 10th Anniversary Of 9-11 Terror Attacks New York City Commemorates 10th Anniversary Of 9-11 Terror Attacks New York City Commemorates 10th Anniversary Of 9-11 Terror Attacks Remembering September 11 New York City Commemorates 10th Anniversary Of 9-11 Terror Attacks New York City Commemorates 10th Anniversary Of 9-11 Terror Attacks New York City Commemorates 10th Anniversary Of 9-11 Terror Attacks New York City Commemorates 10th Anniversary Of 9-11 Terror Attacks New York City Commemorates 10th Anniversary Of 9-11 Terror Attacks Remembering September 11 Remembering September 11 New York City Commemorates 10th Anniversary Of 9-11 Terror Attacks Remembering September 11 New York City Commemorates 10th Anniversary Of 9-11 Terror Attacks Remembering September 11 Remembering September 11 Remembering September 11 Remembering September 11 Remembering September 11 Remembering September 11 Remembering September 11 New York City Commemorates 10th Anniversary Of 9-11 Terror Attacks Photo by Kristoffer Tripplaar-Pool/Getty Images Remembering 9/11 Photo credit should read MANDEL NGAN/AFP/Getty Images Remembering 9/11 Photo credit should read MANDEL NGAN/AFP/Getty Images New York City Commemorates 10th Anniversary Of 9-11 Terror Attacks Photo by Kristoffer Tripplaar-Pool/Getty Images The Annual Tribute In Light Memorial Photo credit should read STAN HONDA/AFP/Getty Images The Annual Tribute In Light Memorial Photo credit should read TIMOTHY A. CLARY/AFP/Getty Images Anniversary Of Sept. 11th Attacks Marked At Pentagon Photo by Win McNamee/Getty Images Washington DC Observes 10th Anniversary Of September 11 Attacks Photo by Mark Wilson/Getty Images President Obama Attends "Concert For Hope" Commemorating 9/11 Attacks Photo by Alex Wong/Getty Images New York City Commemorates 10th Anniversary Of 9-11 Terror Attacks POOL/Noah K. Murray/The Star-Ledger Anniversary Of Sept. 11th Attacks Marked At Pentagon Photo by Win McNamee/Getty Images New York City Commemorates 10th Anniversary Of 9-11 Terror Attacks Photo by David Handschuh-Pool/Getty Images New York City Commemorates 10th Anniversary Of 9-11 Terror Attacks Photo by Timothy A. Clary-Pool/Getty Images President Obama Attends "Concert For Hope" Commemorating 9/11 Attacks Photo by Alex Wong/Getty Images President Obama Attends "Concert For Hope" Commemorating 9/11 Attacks Photo by Alex Wong/Getty Images