A dust mask and other items seized from the martial arts studio of a Mississippi man charged with sending letters laced with a deadly poison to President Barack Obama have tested positive for ricin, according to a court document released on Tuesday.
Tupelo martial arts instructor Everett Dutschke is also charged with sending poisoned letters to two other public officials.
Records seized by the FBI also showed that he ordered castor bean seeds, used to make ricin, from eBay, FBI Special Agent Stephen Thomason said in an eight-page affidavit.
The FBI is investigating how hackers were able to send out a bogus tweet on the Associated Press's Twitter feed that falsely said President Barack Obama was injured in two explosions at the White House.
Reports suggest a United States Border Patrol agent killed in Arizona near the Mexico border earlier this week may have been hit by friendly fire in an accidental shooting involving other agents, according to the FBI.
While it is important to emphasize that the FBI's investigation is actively continuing, there are strong preliminary indications that the death of United States Border Patrol Agent Nicholas J. Ivie and the injury to a second agent was the result of an accidental shooting incident involving only the agents.