'Saturday Night Live' star Tracy Morgan is reportedly in critical condition following a multi-vehicle collision in New Jersey early today that killed one person and injured seven others.

The 45-year-old '30 Rock' star was returning from a concert in a limo bus when the accident occurred in Mercer County, CNN reported quoting Sgt Gregory Williams of the New Jersey State Police.

The limo bus overturned after it was rear-ended by a tractor-trailer. Two tractor-trailers, two cars, an SUV and the limo bus were involved in the accident.

"The limo bus is the only vehicle that overturned. Looks like one of the tractor-trailers may have rear-ended that limo bus, but that's preliminary at this time," Williams said. One person was killed and seven others hospitalised with injuries, authorities said.