An 18-year-old woman is charged with threatening to blow up the Carlton County Sheriff's office at the courthouse in Cloquet.
The criminal complaint filed Friday says Amber Rose Schadewald of Scanlon, Minnesota, admitted to investigators she made the bomb threat and similar ones against agencies or businesses in Minneapolis; Aitkin County, Minnesota; Superior, Wisconsin; and Kansas City.
A conviction in the Cloquet case could bring a sentence of up to three years in prison and a $3,000 fine. Cloquet police say they contacted authorities in Minneapolis and the other jurisdictions so they could start their own investigations.
Police said this week no explosives were found in Cloquet and they do not believe Schadewald had a device capable of blowing up the building.
Allegations in Carlton County
According to the criminal complaint, Cloquet police received an anonymous tip on Monday night saying a bomb would be detonated at the Carlton County Sheriff's office on Thursday at 10:30 a.m.
Police used a subpoena to learn from the internet service provider the address where the tip had originated. The complaint says the investigator, Commander Derek Randall, was familiar with Schadewald through a previous threat she'd made against Cloquet police.
Randall spotted Schadewald at the courthouse on Wednesday and questioned her about the bomb threat, leading to her confession, authorities say.
Specifics about what establishments were threatened in the other areas have not been released.
A Minneapolis police spokesman tells BringMeTheNews the department is in contact with Cloquet police but no decision has been made about whether to pursue charges in Hennepin County.