But heightened concerns, combined with the faulty scanner message, prompted a thorough investigation, Wrinn said.
"Given the time and proximity of each [incident], it would be natural to investigate something like this," Wrinn said.
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In response to the incident, Harvard Police stationed two extra officers on the Southborough campus. City and state police stayed on the scene until 3:30 A.M.
The 20-year-old security guard, who asked not to be named, works for Pinkertons Inc., a private security firm.