COLUMBUS, Neb. (AP) — Police have been investigating reports about an improper relationship between a Columbus High School teacher and a student over the summer.

The school board accepted the teacher’s resignation after a special meeting on Aug. 26, a day after she offered to resign. The boy is a junior at the school.

Columbus Police Capt. Todd Thalken says officers are trying to determine whether any criminal activity has occurred. On Monday online court records didn’t show any charges against the woman.

Schools superintendent Troy Loeffelholz (LEH’-fehl-hohlz) says the district also has reported its information to the state Education Department.