U.S. Sen. Edward Kennedy is still in hospital in Boston, as doctors tried to determine the cause of his seizure, CNN reports. According to medical officials, Kennedy’s condition was serious, but the 76-year-old Democrat is currently out of any “immediate danger.” After several tests on Saturday, it appears he did not suffer a stroke.

Kennedy was airlifted to Massachusetts General Hospital on Saturday morning. compound.

A long time friend of Kennedy, Democratic Senator for Connecticut Chris Dodd, said he got encouraging news when he spoke with Kennedy’s relatives on Saturday.

”I think the reports sound good,” Dodd said, quoted by Reuters. “He seems to be doing pretty well. And we just hope for the very best for him and are confident he’ll be fine," he added.

This is the second time in seven months when Edward Kennedy is hospitalized at Massachusetts General. In October, doctors operated on his neck to unclog a partially blocked carotid artery, which supplies blood to the brain. According to doctors, a blocked carotid artery can lead to stroke and death.

“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,” Kennedy’s primary care physician Dr. Larry Ronan, said. He also added that Kennedy was “resting comfortably and watching the Red Sox game with his family,” CNN reports.

Kennedy suffers chronic back pain from wounds suffered in a plane crash in 1964. He is the youngest brother of late President John F. Kennedy and late Sen. Robert Kennedy, both of them assassinated in the 1960s.