COLUMBUS, Ohio (AP) -- Community vigilance in the wake of Ohio's deadly high school shooting is drawing attention to new and even old threats ranging from potential copycats to routine student scuffles, as students, parents and police try to prevent further violence.
At least three other schools have been evacuated or locked down.
The threats and school closings came after a gunman opened fire Monday at Chardon High School, killing three students and seriously wounding two others.
Separately, authorities in northeast Ohio detained a 17-year-old Crestwood High School student for allegedly posting a photo of himself on Facebook with an assault rifle. A 19-year-old in Strongsville was arrested after a social media exchange involving the shooting resulted in a physical threat.
Several other area schools were evacuated or locked down for various incidents.