WASHINGTON, Nov. 7 ? The national commission investigating the Sept. 11, 2001, terrorist attacks voted Friday to subpoena the records of the North American Aerospace Defense Command for information it promised but did not deliver.
It would be the second subpoena issued by the commission, which has complained of delays by some government agencies in providing information needed to complete the investigation by a May deadline.
The commission subpoenaed the Federal Aviation Administration in October, accusing it of slowing the probe by not providing timely and complete information.
The panel in May requested information on air traffic control tracking of hijacked aircraft and the agency?s communication with NORAD, the U.S.-Canadian military alliance that scrambled fighter jets during the attacks.
Some members of the commission are interested in the time sequence for notifying the jets that headed to Washington where one of the hijacked planes struck the Pentagon.
?The commission has encountered some serious delays in obtaining needed documents from the Department of Defense,? the panel said in a statement.