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Courtesy of Central Connecticut State University, Associated Press
In this Monday, Nov. 4, 2013 photo provided by Central Connecticut State University senior David Kyem, son of CCSU geography professor Peter Kyem is seen in a surveillance photo in an elevator of a campus building in New Britain, Conn. Reports of a person carrying a sword led to a 3-hour campus lockdown. Kyem, 21, was charged with breach of peace and posted bail Monday.

HARTFORD, Conn. — Officials at Central Connecticut State University are defending the police and school response to Monday reports of a masked man with a gun and sword.

Law enforcement swarmed the New Britain campus with SWAT teams and police dogs, and buildings were locked down for three hours. It turned out the man was a student dressed in an apparent Halloween costume that included a real sword and BB handgun.

University President Jack Miller said Tuesday that all potential threats must be taken seriously and officials need to respond to worst-case scenarios.

Classes resumed Tuesday and counseling was offered.

The student, 21-year-old David Kyem of Newington, was charged with breach of peace and posted bail Monday. He didn't return a phone message Tuesday, and it wasn't clear if he has a lawyer.