Image: Michael Chertoff
J. Scott Applewhite / AP file
Homeland Security Secretary Michael Chertoff discusses challenges to the agency on Sept. 5, 2008.
updated 9/10/2008 4:03:09 PM ET 2008-09-10T20:03:09

The nation's top domestic security official says aviation still remains vulnerable to terrorist attack, seven years after 9/11.

Homeland Security Secretary Michael Chertoff says that the al-Qaida terrorist network continues to focus on the aviation system as a target. He also says the Bush administration has made strides in reducing the nation's vulnerability, but that the risk remains.

Chertoff was speaking at the National Press Club. Thursday is the seventh anniversary of the September 11, 2001 attacks, in which terrorists crashed hijacked airplanes into the World Trade Center, the Pentagon and a Pennsylvania field.

Check back for details on this developing story.

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