As of 6 p.m., federal authorities reported no violations of the no-fly zone extending 30 miles around Washington.
The close ally of President Obama was rushed from a congressional luncheon for the new president by medical personnel.
U.S. counter-terrorism officials are aggressively investigating a potential threat of "uncertain credibility" to today's inauguration events posed by an East African Islamic extremist group with ties to al-Qaeda.
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Vice President Cheney will be in a wheelchair for tomorrow's inauguration ceremony after he pulled a muscle in his back.
At the request of Obama aides, Bush homeland security officials will stay on the job Tuesday night to allow their successors to enjoy the festivities around the inauguration of the 44th president.