PRINCETON, N.J. (WPVI) -- Princeton University says an out-of-uniform police officer with a holstered gun led to a warning about an armed man on campus.
Just before noon Tuesday, the school said it had a report of a person with a weapon on campus and told people to lock their doors and "remain inside for safety."
But officials with the Ivy League school quickly determined the man was an officer escorting a group of teens on a tour of the university's art museum.
School officials say the officer was wearing a badge but wasn't in uniform. The gun was never removed from its holster.
The school says the officer didn't alert museum staff to his presence in advance.
The shelter-in-place order was in effect for about 10 minutes.
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Armed out-of-uniform cop spurs Princeton University lockdown
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