WICHITA, Kan. (AP) — Four Wichita middle school students suffered minor injuries when a semi-trailer truck ran into the back of a school bus.

Wichita schools spokeswoman Susan Arensman said the accident happened Thursday morning in southwest Wichita.

She said the bus, which was headed to Allison Traditional Magnet Middle School, was stopped at railroad tracks when the truck, which did not have an attached trailer, hit it.

Arensman said of the 21 students on board, four complained of injuries and two were taken to the hospital with minor injuries.

The cause of the crash is under investigation....