BONNER SPRINGS, Kan. -- A school bus has reportedly overturned on the ramp from K-7 to southbound K-32 in Bonner Springs, Kan. The ramp to southbound K-32 has been closed. At least five ambulances are currently on the scene from Johnson County, Kan. Four people have been critically injured. Five have serious injuries and 20 people have minor injuries. Ambulances are taking injured people to Overland Park Regional Medical Center. Other area hospitals are on stand-by. The bus was from Pembroke Hills School District in Kansas City, Mo. Non-injured students were taken to Bonner Springs High School. Officials said parents should go there to get information.