Tracy Morgan in critical condition after accident

• One person was killed and seven others hospitalized, authorities say


• The former "Saturday Night Live" cast member was riding in a limo bus


• The wreck also involved two tractor-trailers and an SUV, police say

(CNN) -- Actor Tracy Morgan is in critical condition after a six-vehicle accident in New Jersey early Saturday, authorities said.

The former "Saturday Night Live" cast member and "30 Rock" star was riding in a limo bus when the accident occurred in Mercer County, said Sgt. Gregory Williams of the New Jersey State Police.

The limo bus overturned at the New Jersey Turnpike in Robbinsville, he said.

"The limo bus is the only vehicle that overturned," Williams said. "Looks like one of the tractor-trailers may have rear-ended that limo bus, but that's preliminary at this time."

Actor Tracy Morgan in critical condition

Williams said he does not believe alcohol played a role in the accident, but that is under investigation.

In addition to the bus, the wreck involved two tractor-trailers and an SUV, he said.

One person was killed and seven others hospitalized with injuries, authorities said. The fatality may have been another passenger in the limo bus, Williams said.

Peter Haigney, a spokesman for the Robert Wood Johnson University Hospital, said four patients are being treated there.

Three are in critical condition and one is in fair condition, he said.

The hospital said that a man named Tracy Morgan was among those in critical condition, but citing privacy laws, declined to confirm it is the actor. State police confirmed his identity to CNN.

Morgan performed Friday night at the Dover Downs Hotel and Casino in Dover, Delaware, the venue said.

CNN's Suzanne Presto and Carma Hassan contributed to this report. CNN first learned of the accident from multiple Twitter users.