A Copiague Middle School student was arrested Monday for making a threat of mass harm on social media, Suffolk County police say.

Officers responded to the school at around 6:45 a.m. following a 911 call from school officials.

A 12-year-old boy posted a photo on Instagram that showed a gun, police say.

It was determined that the threat was not credible following an investigation.

The student has been charged with making a threat of mass harm. He will be arraigned at a later day.