Security remained high at a Harford County high school Monday morning, the result of a threatening letter that came to the school Thursday.

For the fourth consecutive day, sheriff?s deputies and school resource officers remained extra vigilant at C. Milton Wright High School outside Bel Air, responding in force to a written threat against the student body that kept half the students home on Friday, heightened security at Saturday?s senior prom and kept the school on modified lockdown for another day Monday.

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