– As a nation, a world, we watched a series of frightening images parade across screens and newspaper pages on Sept 11, 2001, and the days that followed. Even a decade later, the photographs have the power to stun the viewer with a sense of horror and disbelief. Here is a small collection of those images.CLOCKWISE FROM TOP: 1) People covered in dust walk over debris near the World Trade Center in New York after the collapse of the twin towers; 2) People in front of New York’s St. Patrick’s Cathedral react as they look down Fifth Avenue toward the World Trade Center after two airliners crashed into the twin 110-story buildings; 3) The Statue of Liberty can be seen at first light in this view from Jersey City, N.J., against a smoke-filled backdrop of the lower Manhattan skyline days after the attacks of Sept. 11, 2001; 4) Emergency responders stand over the crater created when United Airlines Flight 93 crashed near Shanksville, Pa.; and 5) A military helicopter ascends after dropping off personnel at the Pentagon a day after a hijacked airliner, American Airlines Flight 77, crashed into the Department of Defense building in Washington.

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Photos by The Associated Press

CLOCKWISE FROM TOP LEFT: 1) The south tower of the World Trade Center complex starts to collapse as smoke billows from both of the twin towers in New York’s lower Manhattan; 2) United Airlines Flight 175 approaches the south tower of the World Trade Center in New York shortly before its collision at 9:03 a.m., as smoke billows from the north tower, which had been struck by American Airlines Flight 11 at 8:46 a.m.; 3) The collision into the south tower results in a powerful explosion; 4) A closeup view captures the collapse of the south tower as dust and debris rain down on the street below; and 5) With the dust-shrouded skeleton of the World Trade Center’s twin towers in the background, New York City firefighters work amid debris on Cortlandt Street after the terrorist attacks.

Photos by The Associated Press