Findlay High School went into a Level 2 lockdown on Friday morning.
High School Principal Ryan Imke says the lockdown was for precautionary reasons to investigate a concern.
He said the concern was investigated and determined to not be a threat and the lockdown was lifted.
The lockdown was in place for about a half hour, from 11:15 to 11:45 a.m.
A Level 2 lockdown calls for the doors to the school to be locked and for no one to leave the building or the classroom they are in.
The school returned to a normal two-hour delay schedule for the rest of the day.