[ArgusLeader] Authorities discovered a "concerning" amount of bomb-making equipment and illegal guns after a man was arrested on burglary charges in Sioux Falls on Tuesday night.The Minnehaha County Sheriff's Department served a search warrant Tuesday afternoon on 1112. S. Blaine Avenue in eastern Sioux Falls to arrest Mark Christopher Einerwold, 43, on burglary charges related to recent thefts in Dell Rapids and Tea, Minnehaha County Sheriff Capt. Jason Gearman said.
While searching the residence and Einerwold's vehicle, bomb-making materials and illegal firearms were found, Gearman said.
Authorities found other evidence that Einerwold has an "extreme hatred for police, fire and government," Gearman said. "It's safe to say we stopped something from happening. We don't know what that is."
In court, the prosecutors said that when police searched Einerwold's home, a pistol, sawed-off shotgun and a silencer were found in a backpack believed to be the same one used in several local burglaries. They also said authorities found a "manifesto" or document that included threats toward law enforcement and the government.
The sheriff's department had earlier said Einerwold was connected to Antifa, specifically citing a jacket that was found in his apartment. They declined to provide additional evidence.
People near Einerwold's residence weren't allowed to return to their homes until late Tuesday night and early Wednesday morning as crews took care of the material that was found, Gearman said. An improvised explosive device was found inside Einerwold's vehicle and was neutralized on scene.
Gearman said ammonium nitrate and aluminum powder were found in Einerwold's residence.
"The amount of explosives found was significant and concerning," Minnehaha County Sheriff Mike Milstead said.
The sheriff's department is asking anyone who knew Einerwold or may have known what his motives were to come forward and contact authorities.
"We may have prevented a big tragedy, and we don't know what that could have been," Milstead said.