Police officials said they were made aware about 8:50 a.m. of a “possible threat” made on social media against the school in the 800 block of Park Row Drive.

Arlington police said someone reported an "inappropriate relationship" between a teacher and a student. Officers responded to campus, but said they found no credible evidence. Criminal charges against an unknown person or people are pending.

A threat on social media prompted extra security at Arlington High School on Monday morning. However, the school district said it found the threat was not credible, and everyone is safe.

KRLD is looking into reports about Arlington High School being placed under ‘shelter as a precaution’ on Monday morning after threats made to the school online.