The Ohio-based the Ottawa County Sheriff 's Office reviewed more than 800 school threats covered in the media during the first half of the 2014-15 academic year . Researchers found that about one-third of cases involved violent remarks sent anonymously via text message , social media or other online means .
The Ohio-based National School Safety and Security Services reviewed more than 800 school threats covered in the media during the first half of the 2014-15 academic year . Researchers found that about one-third of cases involved violent remarks sent anonymously via text message , social media or other online means .