Two suspicious envelopes suspected to contain the deadly toxin ricin are being analyzed by the FBI after being mailed to the Pentagon. A source familiar with the incident tells NBC News there are no indications that anyone has been exposed to the substance. The mail never made it to the Pentagon after being flagged at a separate screening facility. The envelopes were reportedly addressed to Secretary of Defense James Mattis and the Chief of Naval Operations, Admiral John Richardson.
Meanwhile, a suspicious substance was also found inside an envelope at Texas Senator Ted Cruz' campaign headquarters in Houston.