( CNN ) -- One child died and several were injured Friday in Bolivar County , Mississippi , when a school bus collided with a tractor-trailer on a foggy stretch of road , officials said . The bus was carrying elementary-school and high-school students when the accident happened around 7 a.m. Friday , said Cedrick Ellis , superintendent of the Shaw School District , in Shaw , Mississippi . A `` younger child '' was killed in the accident , said Dr. J.O . Trice , a deputy county coroner . Ellis said the bus and a tractor-trailer loaded with gravel collided , causing both vehicles to overturn . The Mississippi Highway Safety Patrol is investigating , Ellis said . It was not clear if the fog contributed to the crash , . CNN 's Maria White and Vivian Kuo contributed to this report .
One child was killed in an early morning bus crash in Mississippi . The other children were injured and are expected to survive.