6 YEAR OLD CHILD BECAME ENTANGLED IN REAR CENTER SHOULDER BELT (UNFASTENED). BELT RETRACTED IN THE PROCESS CONSTRICTING THE CHILD'S ABDOMEN. MOTHER COULD NOT FREE CHILD DUE TO LOCKING MECHANISM BUILT INTO SEAT BELT. AUTO DEALERSHIP AND POLICE OFFICER CAME TO SCENE AND COULD NOT FREE CHILD FROM THE BELT. BELT CONSTRICTED TO THE POINT THAT THE CHILD WAS UNABLE TO BREATH. BELT WAS CUT FREEING THE CHILD.*AK