UNION, NJ – Police have provided additional information about the incident that caused Union High School administration to direct all students through the main entrance of the school on Tuesday morning, triggering concern and speculation.

According to Union Police Captain Robert Perez, a Union High School senior had an argument in one of his classes on Monday.  The student subsequently posted some disturbing information on a social media site.

Perez said police received numerous calls from students and their parents about the post.  Police interviewed several of these students.  The student who posted the threat on a popular social media site was then identified.

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The student and his family were interviewed by police.  The student, an adult, agreed to voluntarily go to Trinitas Hospital for evaluation.  Perez said he has since been admitted.

Police Director Dan Zieser said there were no weapons involved in the incident.  The type of threat was not identified.