This undated photo obtained from the facebook page of Paul Kevin Curtis, shows, according to neighbors, Paul Kevin Curtis, 45. Curtis was arrested Wednesday, April 17, 2013, at his home in Corinth, near the Tennessee state line. He is accused of mailing letters with suspected ricin to to national leaders. (AP Photo)

CORINTH, Miss. (AP) — The Mississippi man accused of mailing letters with suspected ricin has been charged with threatening President Barack Obama and others.

The U.S. Department of Justice said in a news release Thursday that 45-year-old Paul Kevin Curtis faced two federal charges accusing him of threatening the president and others.

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, U.S. Sen. Roger Wicker and a judge in Mississippi told the recipients: “Maybe I have your attention now even if that means someone must die.”

Copyright 2013 The Associated Press.