This newly released aerial photo by New York City Police Department and provided on Feb 10, 2010 by ABC News shows the collapsing World Trade Center in New York following attacks by terrorists who flew two airliners into the towers. (Courtesy of ABC News / NYPD / Detective Greg Semendinger via AFP)

This and other aerial photos from the 9/11 attacks were obtained by ABC News, who in 2009 filed a Freedom of Information Act request with the National Institute of Standards and Technology. (Courtesy of ABC News / NYPD / Detective Greg Semendinger via AFP)

The World Trade Center on fire after two airliners controlled by terrorists crash into the towers. (Courtesy of ABC News / NYPD / Detective Greg Semendinger via AFP)

The sky turns smoky as the World Trade Center in New York collapses following attacks by terrorists who flew two airliners into the towers. (Courtesy of ABC News / NYPD / Detective Greg Semendinger via AFP)

This newly released aerial photograph was captured on September 11, 2001 by the New York City Police Department and provided on February 10, 2010 by ABC News. (Courtesy of ABC News / NYPD / Detective Greg Semendinger via AFP)

This newly released aerial photograph was captured on September 11, 2001 by the New York City Police Department and provided on February 10, 2010 by ABC News. (Courtesy of ABC News / NYPD / Detective Greg Semendinger via AFP)

An aerial photo of the New York skyline after the terrorist attacks by the al-Qaida. Qaida chief Osama bin Laden is still being hunted. (Courtesy of ABC News / NYPD / Detective Greg Semendinger via AFP)