Defense officials say the suspect packages were sent for testing; Lucas Tomlinson reports from the Pentagon.
Two pieces of mail delivered to the Pentagon mail facility on Monday have initially tested positive for ricin, according to a United States defense official.
An envelope addressed to President Donald Trump contained a substance suspected to be ricin and appeared to be connected to similar envelopes sent to the Pentagon, a law enforcement source told CNN.
WASHINGTON-Two letters sent to the Pentagon that were initially believed to contain the deadly poison ricin instead included castor seeds, from which the poison is derived, a spokeswoman said Wednesday.
The package sent to Cruz made it into his office and two people there were rushed to the hospital over fears of exposure, but the Federal Bureau of Investigation field office in Houston said late Tuesday that lab results indicated the substance on that package was not hazardous.
When asked about the letters sent to the Pentagon, a Secret Service spokesman told CNN that "the Secret Service can confirm receipt of a suspicious envelope addressed to the President on October 1, 2018". The FBI said the envelopes posed no threat.
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Ricin is a highly toxic substance extracted from castor beans, and has figured prominently as a bioweapon in a number of foiled terrorist plots.
"The FBI is still investigating", White's statement said. It can be used in powder, pellet, mist or acid form.
All mail received Monday at the Pentagon facility was quarantined, according to a Pentagon statement released Tuesday.
On the same day, the Secret Service disclosed that it had intercepted a suspicious envelope addressed to Trump, but noted that the envelope did not enter the White House.
Ricin is a deadly poison that is naturally found in castor beans, according the national Centers for Disease Control and Prevention.