PENSACOLA — Noah D. Stirn, who was arrested in June for sending bomb threats to government centers from a Santa Rosa County prison cell, has pleaded guilty to federal charges related to the incident.


Stirn, 24, entered guilty pleas to 12 charges. He faces up to five years imprisonment on each of six counts of mailing a threatening communication and 10 years for each of six counts of threatening to use an explosive, according to an indictment.


Lawrence Keefe, United States Attorney for the Northern District of Florida, announced the plea in a news release issued Friday.


The FBI filed the federal charges against Stirn after determining that between April 22 and May 20 he had sent about 21 letters to courthouses and government buildings in Northwest Florida. Each letter claimed that C4 plastic explosives had been placed inside the building it had been mailed to.


“Stirn’s letters asserted that he was not pleased with the federal government and his actions were ’for the cause of the Islamic State,’” the news release said.


“Protecting the security of our government agencies and employees and the services they provide to the public is paramount to maintaining a functioning society,” Keefe said in the release.