The Harford County sheriff said he's working with county and school officials--their top priority to keep staff and students safe after the fatal shooting at Jo

Threats of mass violence continue to plague Maryland schools, this time leading to charges against a student on Wednesday morning in Harford County. Early on Sept. 25, deputies were alerted about a reported claim from a teen made on social media "to shoot up the school.

The Harford County Sheriff's Office is warning of an increase in threats made against schools, including one that resulted in an arrest overnight.