A man in California was detained by FBI agents after investigators alleged that he was communicating and “plotting” with the 15-year-old girl responsible for a mass shooting at a small Christian school in Wisconsin.
Alexander Paffendorf, a 20-year-old resident of Carlsbad, California, was served a gun violence restraining order by FBI agents on Tuesday night, local channel CBS 8 first reported.
The document accuses Paffendorf of “plotting a mass shooting” with Natalie “Samantha” Rupnow, the 15-year-old student at Abundant Life Christian School in Madison, Wisconsin, whom police identified as the shooter who killed two people and injured six more in a mass shooting on Monday.
On the restraining order, investigators wrote that “Paffendorf admitted to the FBI agents that he told Rupnow that he would arm himself with explosives and a gun that he would target a government building. FBI agents saw the messages from Paffendorf to Rupnow.”
The document did not identify a particular government building he intended to target.
The order is a civil action, allowing authorities to seize Paffendorf’s firearms. A neighbor told the local station they saw federal agents carrying what appeared to be black gun cases out of Paffendorf’s apartment.
The Madison Police Department and the FBI’s San Diego field office did not immediately return requests for comment from the Daily Beast.
A hearing will take place on Jan. 3, according to the document. It was not clear if Paffendorf was still in custody on Wednesday night—or whether he would be charged criminally.