SPARTA, Wis. -

Sheriff's officials say a teen driver slammed into the back of a school bus in Monroe County, injuring herself, the bus driver and 14 students.

Authorities said the school bus was stopped on Highway 21 in the Town of Greenfield Wednesday morning with its lights and stop arm operating, and was loading children when the 18-year-old driver hit the back of the bus and slid underneath. The driver was extricated from the car and taken to a Tomah hospital. Authorities said she's expected to survive.

The bus driver and students were treated for minor injuries at Tomah Memorial. Nineteen other students were checked at the hospital.

The Monroe County Sheriff's Department is investigating.