BOVINA, Miss. (AP) — Seven people were killed and dozens were injured in Mississippi after a commercial bus overturned on Interstate 20 on Saturday morning, according to the Mississippi Highway Patrol.

Six passengers were pronounced dead at the scene and another died at a hospital, according to a news release. The bus was traveling west when it left the highway near Bovina in Warren County and flipped over. No other vehicle was involved.

The dead included a 6-year-old boy and his 16-year-old sister, according to Warren County Coroner Doug Huskey. They were identified by their mother. Authorities were working to identify the other victims, he said.

Thirty-seven passengers were taken to hospitals in Vicksburg and Jackson. The department is continuing its investigation and hasn’t released the names of the deceased. No other information was immediately provided.