Packages sent to Pentagon that tested positive for ricin are suspected to have been mailed by a former Navy sailor, officials say

By Lucas Tomlinson | Fox News

Packages with suspicious substances -- at least two of which tested positive for ricin -- sent to the Pentagon, White House and Sen. Ted Cruz's office in Texas this week were part of a coordinated effort by a former Navy sailor, officials told Fox News.

Investigators said one of the envelopes, addressed to Defense Secretary James Mattis or the Navy's top officer, Adm. John Richardson, contained a return address leading them to believe it came from the sailor, whose name has not been disclosed.

Officials say a tip from the White House led the Pentagon to discover the two packages sent to the Pentagon.

Both initially tested positive for ricin but are now in the hands of the FBI for further testing.

The packages never made their way into the Pentagon, but were flagged in a mail delivery building next door on Monday, a Pentagon spokesperson confirmed to Fox News.

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