SIOUX FALLS, S.D. (KELO AM) - Authorities found a suspect's phone number on voice mail left on a bomb threat called into Southeastern Behavioral last week. Officer Sam Clemens says 39-year-old Alexis Rasmussen is accused of leaving the bomb threat on an employee's voice mail at night when the office was empty. Clemens says Southeastern employees discovered the threat Friday morning. They evacuated the building on their own and didn't find anything suspicious. They did find a phone number from the caller. Clemens says Rasmussen was arrested in his apartment on North Phillips Avenue and charged with falsely reporting a threat or bomb.