Hazelwood, MO  ( KTRS )  The Major Case Squad is investigating a highway shooting in north county that’s left one dead and three injured.

Investigators say shots were fired from a vehicle traveling on I-270 near Lindbergh in Hazelwood early Sunday morning. A woman in another vehicle was killed in the gunfire. Two others are in serious condition and another has been released from the hospital. No arrests have been made in the case.

Police say they are looking for the occupants of a dark-colored sedan, from which authorities believe someone opened fire on the second vehicle.