WASHINGTON — Sen. Edward M. Kennedy, D-Mass., battling a brain tumor, became ill at a post-inauguration luncheon for President Barack Obama on Tuesday and was taken by ambulance to a hospital.

There was no immediate word from medical personnel on his condition.

"It looked like a seizure," said Sen. Orrin Hatch, R-Utah, who said he was with Kennedy until they reached the ambulance.

Kennedy, 76, had appeared in good health and spirits hours earlier when he stepped out of the Capitol and onto the inauguration platform where Obama took the oath of office.

Sen. Robert C. Byrd, 91, also was taken from the luncheon but it was not clear whether his departure was prompted by his health.