Hoax threats across North Carolina on Thursday led to schools being locked down and officers from city and county agencies responding to campuses.

Threats of shootings on school campuses were reported Thursday in multiple North Carolina counties, including Wake, Durham, Mecklenburg, New Hanover, Alamance, Forsyth and Cumberland, the Charlotte Observer reports.

Authorities described these “swatting” calls as being part of a nationwide trend of hoax school shooting calls.

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