The photos, taken from a helicopter by New York Police Det. Greg Semendinger, show the twin towers in flames, falling amid huge, billowing clouds of dust, debris and smoke that envelop downtown Manhattan.
This photo taken Sept. 11, 2001 by the New York City Police Department and obtained by ABC News, which claims to have obtained it under the Freedom of Information Act, shows smoke and ash engulfing the area around the World Trade Center in New York.
This photo taken Sept. 11, 2001 by the New York City Police Department and obtained by ABC News, which claims to have obtained it under the Freedom of Information Act, shows smoke and ash engulfing the area around the World Trade Center in New York.