COLUMBUS (AP) — An entire school district and a high school in central Ohio along with three Toledo schools are closed because of threats.

Logan-Hocking School District officials announced that classes throughout the district were canceled Friday “due to a threat made toward area schools” that police are investigating.

A threat made Thursday to a student by an “unknown caller” prompted officials in Fairfield County’s Lancaster City School District to cancel classes at Lancaster High School on Friday. Lancaster police and the Fairfield County Sheriff’s Office are investigating. All other Lancaster district schools remain open.

Both districts are southeast of Columbus.

Toledo police say social media threats by someone identifying themselves as “B Shooter 15” prompted closings Friday at a high school and two middle schools at the Washington Local Schools in Toledo.

The Columbus city schools say there will be an increased police presence at buildings in the district Friday after several threats were made on social media.