(CNN) -- Students at Princeton University were asked to remain indoors briefly Wednesday after a report of an armed man on campus, but police determined that there was no gunman, according to the university's Web site.
However, four juveniles with a toy gun were taken into custody, New Jersey State Police said on the Web site Twitter. The state police said they had been given the information by Princeton University police.
The university Web site said the investigation continues "with Princeton Borough and Township police, who have reopened the campus."
"Shortly before 11 a.m., a male with what appeared to be a handgun was reported near the vicinity of Dod Hall dormitory," the notification said.
The all-clear was issued at 11:25 a.m., the university said.
CNN's Ross Levitt contributed to this report.
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