A photographer witnessed the spectacular collapse of the Twin Towers.
Phil Penman, from Bryanspuddle, Dorset, UK, captured over 500 images of the tragic events of September 11, 2001 in New York.
At the time, the Islamic extremist group al-Qaeda hijacked U.S. airliners and crashed them into the World Trade Center, killing thousands.
On the 22nd anniversary of 9/11, Mr. Penman recalled witnessing the tragic event through the lens of his camera.
