Schools in a Montgomery County district were closed Monday due to an investigation into a potential threat that was posted on social media but ultimately determined to be a "misunderstanding."
Classes in the Upper Perkiomen School District were canceled while authorities investigated a threatening post on Instagram, the district said.
That threat was deemed not credible and classes will resume Tuesday, officials said. Monday's after-school activities will also take place.
Police said the preliminary investigation found that the social media posting that prompted the closing contained screen shots from a video meant to curtail gun violence and identify warning signs of potential violence. That video was originally posted by sandhookpromise.org, an anti-gun-violence nonprofit founded by families of victims of the 2012 massacre at Sandy Hook Elementary School.