OXFORD, Miss. (AP) — A federal official says the man charged with sending poison letters to President Barack Obama, a U.S. senator and a Mississippi judge has been released from jail.

Jeff Woodfin, chief deputy with the U.S. Marshals Service in Oxford, Miss., says Paul Kevin Curtis has been released from custody.

Woodfin says he doesn't know if there were any conditions on the release.

The development comes hours after officials canceled a detention and preliminary hearing on Tuesday.

Curtis was arrested Wednesday at his house in Corinth, Miss., and charged with sending ricin-laced letters to Obama, Sen. Roger Wicker and a Lee County, Miss., judge.

Through an attorney, the 45-year-old Curtis has said he is innocent.