Earlier Tuesday, two people were hospitalized in Houston after a "white powdery substance" was found in a letter addressed to the campaign headquarters of Texas Sen. Ted Cruz in Houston, law-enforcement sources said.
The condition of the victims was not clear.
The Republican senator's spokeswoman, Catherine Frazier, said no Cruz staffers were taken to the hospital.
Frazier added that the package was opened in the lobby, resulting in a temporary lockdown.
The Houston Fire Department said in a tweet that the ninth floor of the Phoenix Tower was evacuated as a hazmat team worked to determine the nature of the substance.
The Houston scare came to light hours after NBC News reported that two suspicious envelopes containing the deadly toxin ricin were mailed to a Department of Defense mail processing center.
The envelopes were addressed to Mattis and Chief of Naval Operations Adm. John Richardson, a source familiar with the incident told NBC News.
There were no indications anyone had been exposed to the suspicious substance, the source said.
The mail facility is on the Pentagon campus but not within the main building itself, said Pentagon spokesman Christopher Sherwood.
Law enforcement officials said all four letters, including the two sent to the Pentagon, appear to have come from the same person.
Col. Rob Manning, a Pentagon spokesperson, said in a statement that on Monday the Pentagon Force Protection Agency "detected a suspicious substance during mail screening at the Pentagon's remote screening facility."
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