Reports of threats resulted in school districts canceling classes for today.
In addition, Columbus Schools say they will have an increased police presence because of threatening posts on social media.
It reflects a national trend since the school shooting in Parkland, Florida, that left 17 people dead.
Media reports say Lancaster High School closed after receiving a threatening telephone call on Thursday. Other schools in the district will be open, the Dispatch reports.
Licking Heights Central Middle School will be closed as Pataskala Police investigate a shooting threat made by a seventh-grader, the Dispatch reports. Students and parents reported the threat to the district.
All classes were canceled at Logan-Hocking School District because of a threat.
Posts on social media have resulted in Columbus police planning to beef up its presence Friday at its schools.
The Dayton Daily News reports four students ... one from Springfield, two from Fairborn and another from New Lebanon ... were arrested Thursday after threats were made, and that at least two other districts investigated reports of threats.