Students were evacuated from Valley Regional High School in Deep River early Monday afternoon after someone called in a bomb threat, according to the superintendent.
State police said they were called to the school on Kelsey Hill Road around 12:30 p.m. Monday and sent a bomb-sniffing dog to search the property.
The school was evacuated and students were bused to John Winthrop Middle School as a precaution, according to superintendent Dr. Ruth Levy.
Investigators searched the property and gave the "all clear" at 1:15 p.m., according to state police. Levy, who sent a message to parents informing them of the incident, said the school has been deemed safe.
Police continue to investigate the threat.