A Colorado man who lived near a park crafted explosives he claimed could kill everyone within 20 meters, hoping to trade the bombs and other weapons for cocaine or cash, authorities said.
Special agents with the federal Bureau of Alcohol, Tobacco, Firearms and Explosives arrested Richard Sandberg, 35, on Thursday morning as he was heading to work, said Jeffrey Dorschner, a spokesman for the U.S. Attorney's Office in Colorado.
In the afternoon, he appeared in federal court, where he was ordered held without bond until at least a detention hearing Tuesday.
His arrest followed an undercover sting that revealed the suspect had an arsenal of "homemade" improvised explosive devices and military-grade grenades in his suburban Denver home, according to an affidavit filed by an ATF agent in federal court.
The investigation began a week ago, when a Denver police detective alerted an ATF agent about a claim from a "reliable" informant.
The informant had gone to Sandberg's house and saw "numerous hand firearms and hand grenades" the suspect "wanted to trade ... for cocaine," according to the affidavit.
That night, an undercover ATF agent talked over the phone with Sandberg, who said he was a former member of a Marine special operations unit.
He claimed to have 18 M67 grenades -- which are available only in the military -- that he said he'd sell for $300 each, the ATF agent wrote.
According to the affidavit, Sandberg said he'd built some explosive devices with items available at hardware stores. He said you'd need a "formula" to know how to make them blow up -- and they had a "kill zone" of 20 meters and a "hurt zone" of 60 meters.
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