The man sought to purchase a gun silencer in August but was denied after self-reporting mental health issues on a federal form, the gun store owner said.
The sheriff said that the threats prompted an alert to all law enforcement agencies in the state, weeks before the gunman, an Army reservist, fatally shot 18 people this week.
After two long days of being locked down amid the manhunt for a gunman who killed 18 people, the small city in Maine started to come back to life, forever changed.