FBI officials suspect Oklahoma inmate sent anthrax hoax letters

The Federal Bureau of Investigation said on Friday that it suspects an inmate from the Oklahoma State Penitentiary in McAlester, Oklahoma, sent anthrax hoax letters to state and federal offices across the country.

The U.S. Attorney's Office for the Eastern District of Oklahoma received the first suspicious letter on Wednesday. The letter was allegedly from an Oklahoma prison inmate who claimed the white powder contained in the correspondence was deadly anthrax, News9.com reports.

The FBI interviewed the inmate and learned he allegedly sent similar letters to the Oklahoma State Attorney General, the Oklahoma City offices of the FBI and the U.S. Attorney. The three letters were found on Thursday and contained a white, powdery substance. Initial field tests and preliminary lab work indicated the white powder was not anthrax.

Agents from the Secret Service and the FBI, along with Oklahoma County sheriff's deputies, Oklahoma City police and hazardous material crews, responded to all three anthrax hoax locations and removed the letters.

The U.S. Postal Inspector's Office intercepted a letter sent to the U.S. Court of Appeals in Washington, D.C. on Friday.

The FBI has yet to release the name of the suspect, according to News9.com.