A BB gun prompted a lockdown at Killingly High School on Tuesday morning.
School officials said two students reported a potential threat within the school around 11:30 a.m. and the school was placed on immediate lockdown.
Officials said students were kept in classrooms to help expedite the investigation.
Connecticut State Police were notified and after a thorough investigation, students were released back to class around 12:20 p.m.
The item that was discovered was a plastic BB gun, according to school officials.
Police are continuing to investigate to determine who was involved.
