Students at Hartford Union High School are calling it a joke gone wrong, after a back and forth argument on Twitter ended with a threatening post. 

The school was dismissed early Tuesday, as Police arrested a 19-year-old student responsible for that post. 

      "It was just a picture of a gun," says student Dante Arangyz. "I know the dude, and he would never hurt a fly." 

The student involved was not in school today, and he was not found at home. Police tracked the subject's cell phone to the Kettle Moraine Forest, where he was found with a pair of firearms.

According to Hartford Police Department, the subject had posted previous threats against fellow students on social media. Those threats had gone unreported. 

The HUHS administration will also be exercising appropriate disciplinary actions at the conclusion of the administrative investigation.

The HUHS administration has determined, based on the conclusions of the law enforcement investigation, that HUHS is safe for students and staff, and will be open tonight and tomorrow.