Students at Heritage High School in Rockdale County attended school virtually on Monday because of threats on social media.

The Rockdale County Sheriff’s Office says they are actively investigating several threats made against a county high school during last week’s winter break. Authorities say they’ve identified two students who are responsible for making the initial threat which was published on social media last Wednesday.

School officials said the district was made “made aware of threats on social media over the winter break and overnight last night.”