ST. LOUIS (AP) — All 13 children injured in a school bus accident near St. Louis have been released from the hospital.

The crash happened about 8 a.m. Thursday on Interstate 44 in St. Louis County after the bus swerved to avoid an accident, drove over a guardrail and down a steep embankment. The bus was taking St. Louis voluntary desegregation students to the Hanna Woods Elementary School in the suburb of Manchester.

Highway Patrol Sgt. Al Nothum says a car struck the median and spun toward the bus. It isn’t clear whether the vehicles collided, but the bus swerved and ended up about 15 feet (5 meters) down a hill.

All of the children were treated at St. Louis Children’s Hospital for scrapes and bruises. The bus driver is hospitalized but expected to make a full recovery.