Questions abound over the origin of letters sent to the White House and The Pentagon that were found to contain ricin, the highly toxic substance made from castor beans.

Reports suggest that two packages were stopped Monday at a mail facility before they entered the Pentagon. The packages were addressed to U.S. Secretary of Defense James Mattis and the Navy’s top officer, Admiral John Richardson.

It has now been confirmed that the Secret Service intercepted a third package addressed to the President.

“The envelope was not received at the White House, nor did it ever enter the White House,” a statement noted, adding “We can confirm that we are working jointly with our law enforcement partners to fully investigate this matter.”

In a potentially related incident, a “white powdery substance” was discovered in mail sent to Senator Ted Cruz’s Houston campaign office.

The Houston Fire Department confirmed that the building had been evacuated, and that two people have been hospitalized.

Two people were taken to the hospital after apparently being exposed to a white powdery substance in an office building at 3200 SW Fwy. The 9th floor of the Phoenix Tower has been evacuated as HFD HazMat is responding to the scene working to determine the nature of the substance. — Houston Fire Dept (@HoustonFire) October 2, 2018

It has not been confirmed if the incidents are linked, or that the substance at Cruz’s office is also ricin.

If inhaled, ricin can cause nausea, vomiting, and ultimately a painful death within hours if the toxins trigger internal bleeding and respiratory failure.

The substance is fairly easy to create with castor beans being readily available. Thus it is considered a crude form of poisoning, certainly not indicative of a sophisticated plot.

In previous incidents involving ricin sent to politicians and authority figures, the perpetrators have been determined to be mentally disturbed individuals.

Last week Senator Cruz was harassed and forced to leave a restaurant by members of a leftist mob, who described the Senator as a ‘fascist’.

BREAKING. Activists just chased @TedCruz out of a fancy Washington DC restaurant, chanting “We Believe Survivors!” Cruz has been friends with creep Kavanaugh for 20 years. Now Cruz is on judiciary committee hearing his testimony. Fascists not welcome! #CancelKavanugh pic.twitter.com/7mx6Tc32za — Smash Racism DC (@SmashRacismDC) September 25, 2018

The group, which calls itself ‘Smash Racism DC’ vowed on Twitter, “You are not safe. We will find you.”

“This is a message to Ted Cruz, Bret Kavanaugh, Donald Trump and the rest of the racist, sexist, transphobic, and homophobic right-wing scum: You are not safe. We will find you. We will expose you. We will take from you the peace you have taken from so many others.” the tweet read.

One founder of the group is Antifa supporting professor Mike Isaacson who previously tweeted about teaching “future dead cops” and assassinating Mike Pence.

The leftist mob that confronted @tedcruz and his family and that is now threatening them is lead by the former @JohnJayCollege Prof., Mike Isaacson, who has openly advocated for violence against his political enemies. cc: @DHSgov @FBI pic.twitter.com/987Byk4Fxc — Far Left Watch (@FarLeftWatch) September 25, 2018

Isaacson previously tweeted his desire to “Kill all white people born before 1962.”

On the day of the presidential election, Isaacson tweeted, “Reminder that if Trump does end up winning this stupid thing to assassinate Mike Pence *first*.” The tweet has not been deleted and remains active.

The leader of the antifa goup that confronted @TedCruz and his family previously called for the assassination of Mike Pence on his @Twitter account. The tweet is still live: https://t.co/t4zmktByhg pic.twitter.com/bNeEU4glOY — Far Left Watch (@FarLeftWatch) September 25, 2018

Here he is encouraging people to, “Kill your local politicians before they kill you.”

Kill your local politicians before they kill you https://t.co/JiEKuTNWy6 — Mike Isaacson (@VulgarEconomics) May 12, 2017

It is not known whether Isaacson still has any involvement with the group that harassed Cruz, but given their apparent threats his views certainly seemed to be shared by the group.

There have been several incidents recently involving the ‘doxxing’ of Republicans and harrassment by leftist mobs.

Press Secretary Sarah Huckabee Sanders, Florida Attorney General Pat Bondi, Senate Majority Leader Mitch McConnell (R-KY), DHS Secretary Kirstjen Nielsen and White House advisor Stephen Miller have been recently targeted by such angry mobs.

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