Authorities say two people are dead and four others are injured after an SUV crashed into a tractor-trailer on Interstate 95 near Brunswick.

Georgia State Patrol Cpl. R.A. Sikes said the fatal crash early Tuesday killed a 50-year-old woman and a 6-year-old boy in the SUV.

He said both vehicles were traveling south on I-95 when the SUV ran into the back of the tractor-trailer about 60 miles south of Savannah.

Four others from the SUV were taken to a hospital. Sikes said he did not know their conditions or whether any of them were seriously hurt.

State troopers are investigating what caused the crash.