GLOBE, Ariz. — An administrator at a Globe middle school has resigned after failing to notify police of a possible threat to the school.

The administrator’s resignation was announced in a letter to parents that was posted on Globe Unified School District’s website Monday, but the person wasn’t identified.

District officials say the administrator High Desert Middle School learned on March 28 of a threat that included a map and plan for a homemade bomb and handguns, but didn’t alert authorities.

A parent told Globe police of the situation and four students have been charged with felonies and been suspended from school.

According to police, the former school administrator could be facing endangerment charges.

The mining town of Globe is located 75 miles (120 kilometers) east of Phoenix.