Smoke billows from World Trade Center Tower 1 and flames explode from Tower 2 as it is struck by American Airlines Flight 175 in New York on Sept. 11, 2001.
Smoke billows from World Trade Center Tower 1 and flames explode from Tower 2 as it is struck by American Airlines Flight 175 in New York on Sept. 11, 2001. CHAO SOI CHEONG AP
Smoke billows from World Trade Center Tower 1 and flames explode from Tower 2 as it is struck by American Airlines Flight 175 in New York on Sept. 11, 2001. CHAO SOI CHEONG AP