The Mississippi man accused of mailing letters with suspected ricin has been charged with threatening President Barack Obama, Sen. Roger Wicker and a judge.
The U.S. Department of Justice said in a news release Thursday that 45-year-old Paul Kevin Curtis faces the federal charges.
Curtis was to appear in federal court Thursday. If convicted, he could face up to 15 years in prison.
An affidavit says the letters sent to Obama, Wicker and a judge in Mississippi told the recipients: "Maybe I have your attention now even if that means someone must die."
The U.S. Senate sergeant-at-arms says a private lab has confirmed the presence of ricin in a letter sent to Wicker.
Terrance Gainer said Thursday that the lab tests confirm field testing that indicated the presence of the toxin. He says the ricin was not weaponized.
The letter was found Tuesday at a Maryland mail processing center.