UPDATED - 4:06 p.m. ET
CCSU president Jack Miller, during a present conference Monday afternoon, praised the security systems on campus and the speed with which law enforcement responded.
"Everybody was brave and they were calm," Miller said. "All systems worked as the University hoped it would."
Local law enforcement confirmed that three people of interest are currently in custody. Chris Cevoni, chief of the CCSU's campus P.D., said they couldn't confirm all three were CCSU students, but that all three were of student age.
"We received a 9-1-1 call from someone concerned that a person was wearing camouflage possibly carrying a sword-like weapon or a handgun," Cevoni said.
Police are still investigating the incident. No charges have been filed yet and no weapons have been recovered either.
"Possibly it could have been a Halloween costume, that's what we're looking into," Cevoni said.