Previously unseen photographs of President George W. Bush and his cabinet on Sept. 11, 2001 were released by the National Archives Friday in response to a Freedom of Information Act request.

The pictures shed additional light on the White House's internal reaction to the worst terror attack in U.S. history.

Vice President Dick Cheney's staff photographer took the photographs, which include depictions of senior administration officials engaged in somber talks in the President's Emergency Operations Center.

The emergency operations center is located in a secure bunker below the White House.

The FOIA request that prompted the National Archives to publish the pictures was filed by a producer for the PBS documentary series "Frontline," according to USA Today.