FORT SMITH, Ark. — A Fort Smith man was sentenced to three years in federal prison, followed by three years of supervised release, on one count of Mailing a Threatening Communication.
Court documents reveal that on June 25, 2021, the Sebastian County Court received a letter from David Daniel Dieringer, III, 28. Dieringer threatened to blow up the Fayetteville Federal Courthouse and the White House in the letter.
Dieringer stated in the letter that if the recipient did not communicate the threat, he would kill them. The return address on the letter was to the Sebastian County Detention Center, where Dieringer was an inmate at that time.
Dieringer was interviewed, and reports say he admitted he sent the letter and stated that if given the opportunity, he would carry out bombings of both locations using a pressure cooker bomb. He then described how to assemble this bomb.
He placed a letter addressed to the White House in the Sebastian County Detention Center inmate mail system on July 11, 2021. The letter addressed to President Joe Biden read, “When I get out of federal prison, I’m going to blow up the White House.” Dieringer admitted to writing the second letter as well.
The threats were investigated by the Sebastian County Sheriff’s Department, the United States Postal Service, the United States Marshals Service, and the United States Secret Service.
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