Sen. Edward Kennedy, D-Mass arrives at the U.S. Capitol for the Inauguration of President Barack Obama. (AP Photo/Jae C. Hong)
(AP) WASHINGTON - Doctors blamed fatigue for the seizure that Sen. Edward M. Kennedy, ill with a brain tumor, suffered during a post-inauguration luncheon for President Barack Obama.
Dr. Edward Aulisi, Washington Hospital Center's neurosurgery chairman, said Kennedy was awake, talking with family and friends and feeling well.
In a statement released by Kennedy's office, Aulisi said: "After testing, we believe the incident was brought on by simple fatigue."
Kennedy will remain at the hospital overnight for observation and go home in the morning.
Senate colleague Orrin Hatch said it appeared that Kennedy had a "seizure." He said he was with Kennedy when the senator was put into an ambulance, and that Kennedy was conscious and gave him a grin.
Kennedy, who's 76, has been battling a brain tumor.
A fellow senator, Democrat Jay Rockefeller of West Virginia, said President Barack Obama went over to check on Kennedy after he became ill.
Kennedy had attended Obama's oath-taking on the Capitol's west Front.
Obama later told the luncheon that his prayers are with Kennedy.
Sen. Robert C. Byrd's office says the 91-year West Virginian decided to leave an inauguration luncheon after Sen. Edward M. Kennedy was stricken, but not because of any medical problem of his own.
Spokesman Mark Ferrell said that Byrd was sitting at the Capitol luncheon with Sen. Kennedy when the Massachusetts senator took sick.
Ferrell said, "Sen. Byrd did not have a medical issue - he is just fine."
Ferrell added: "Sen. Byrd made the decision to leave the luncheon once Sen. Kennedy was being taken from the room by medical personnel. Sen. Byrd is currently in his own office in the Senate Hart Building and is doing fine, though remains very concerned about his close friend Ted Kennedy."
(Copyright 2009 by The Associated Press. All Rights Reserved.)