The Mississippi man charged with sending poisoned letters to President Barack Obama, a U.S. senator and a state judge was released from jail on Tuesday, federal official said, though the reason for the release wasn’t immediately clear.

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

A search of Curtis's belongings reportedly turned up no trace of ricin or ricin processing. Curtis, an Elvis impersonator, claims that he was framed.

UPDATE: The AP now reports that charges have been dropped against Curtis.