A student's threat launched a lockdown at Pinkerton Academy in Derry, New Hampshire, which has since been lifted, the school and police confirmed Friday afternoon.
"Pinkerton's lockdown is over and no threat of any kind was found," Pinkerton Headmaster Griffin Morse said in a message on Twitter. "Thank you for your cooperation and we are all relieved to report that everyone is safe and no safety or security was compromised."
The high school was placed in lockdown around noon due to a possible threat on campus, school officials said. Students and staff were ordered to shelter in place, and parents were asked to not call or come by the school.
A student allegedly said he had a firearm and was planning to shot someone. That student, whose name and grade have not been released, was found at school and arrested by Derry police. He did not have a firearm in his possession at the school, according to police.