BOSTON, Massachusetts (CNN) - Doctors at Massachusetts General Hospital Sunday were trying to determine the cause of Sen. Edward Kennedy's seizure.
Medical officials said the 76-year-old Democratic icon was in serious condition but seemed to be out of any "immediate danger."
Preliminary tests Saturday night determined Kennedy had not suffered a stroke, a physician at the hospital said.
Kennedy was flown to the hospital on a medical jet Saturday.
"Over the next couple of days, Sen. Kennedy will undergo further evaluation to determine the cause of the seizure, and a course of treatment will be determined at that time," said Dr. Larry Ronan, Kennedy's primary care physician. He added that Kennedy was "resting comfortably and watching the Red Sox game with his family."
Doctors offered no update Sunday morning.
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