JUST IN: Federal Authorities Investigating Letters Containing “Suspicious Substances” Sent to Congress

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Ahead of midterms, suspicious letters have been sent out to multiple election offices across the country.

Reportedly, the letters contained unknown white powdery substances.

Federal authorities — including the FBI, Capitol Police, and U.S. Postal Inspection Service — are all investigating the matter.

Fox News reporter Bill Melugin shared a statement from the FBI:

BREAKING: FBI confirms to @FoxNews they’re investigating suspicious letters that were sent out nationwide with unknown substances in them, including to some offices on Capitol Hill.

FBI spox:

“The FBI and U.S. Postal Inspection Service are investigating a series of suspicious…

— Bill Melugin (@BillMelugin_) October 15, 2026


BREAKING: FBI confirms to @FoxNews
they’re investigating suspicious letters that were sent out nationwide with unknown substances in them, including to some offices on Capitol Hill.

FBI spox:

“The FBI and U.S. Postal Inspection Service are investigating a series of suspicious mailings sent to various addresses nationwide, including Secretary of State offices and their related election offices. Some of the letters contained an unknown substance and we are working closely with our law enforcement partners to respond to each incident. We are also working with our partners to identify the individual or individuals responsible for the letters. This FBI will continue to safeguard the public and secure elections for American citizens.”

The suspicious letters were sent to the Congressional offices of multiple officials, including Democrat Sen. Chuck Schumer.

NBC News reported further:

The FBI, U.S. Capitol Police and U.S. Postal Inspection Service are investigating letters containing suspicious substances that were mailed to “various addresses nationwide, including multiple Congressional offices,” according to a notice that senior staff in Senate offices received Thursday morning.

“Law enforcement officials are working to intercept any additional letters before they are delivered, however, it is possible that some letters may reach their destinations,” the notice said, according to two people who received it.

The offices of several Democratic senators were targeted, including that of Senate Minority Leader Chuck Schumer, D-N.Y., NBC News confirmed. Two law enforcement sources briefed on the matter confirmed that “dozens of letters” were sent, but because law enforcement continues to intercept the letters, they declined to put an exact number on how many have been received or seized.

The notice included an image of one of the suspicious envelopes and said that the letters “may contain different variations of postage stamps.” It also warned that suspicious letters, packages or substances “should be treated as potentially hazardous and handled in accordance with established safety protocols.”

The notice outlined how staff should handle the items and noted that mail and packages delivered to Senate offices or the Capitol complex are screened and tested for potential threats.

Three law enforcement sources briefed on the matter told NBC News later in the day that preliminary testing of the white powder substance showed that the contents are not hazardous.

However, additional testing will continue to take place at law enforcement labs around the country to ensure the letters do not contain anything dangerous.

In addition, letters were sent to offices in Louisiana, Ohio, and Oklahoma.

This isn’t the first time this has happened, either.

A similar threat occurred leading up to elections in 2023.

Per AP News:

Mailed packages containing a powdery substance led to the evacuation this week of election offices in at least two states, Louisiana and Oklahoma. The Ohio secretary of state said the Postal Service intercepted a package containing a white powder intended for its office and noted that similar mailings had been sent to election officials in multiple states. Numerous states, from Idaho to Florida, said their election offices either received letters or had them intercepted by the Postal Service.

The Wisconsin Elections Commission said in a statement that it received a letter and the white powder enclosed in it as not hazardous, according to tests. “Let this be very clear: this incident will not shake us,” Wisconsin elections administrator Meagan Wolfe said.

News of the letters comes just three weeks before Election Day and is reminiscent of a similar threat in 2023, when election offices in six states received mailings that contained a white powder. In some cases, the incidents disrupted work around local elections.

Some of those letters contained threats and traces of the powerful opioid fentanyl, leading some election offices to stock up on the overdose reversal medication naloxone.

But, this time, we may know who is responsible…

At least one of the letters had “DSA” on the envelope and listed a return address associated with the largest socialist organization in the United States.

Here’s a photo of one of the envelopes:

NEW @scrippsnews: Here's an image of one of the letters sent to multiple Congressional Offices containing "suspicious substances" now under investigation by the Postal Inspection Service, FBI, and Capitol Police.

The investigation & letters were first reported by Punchbowl News pic.twitter.com/xQLJ3pZtEm

— Nathaniel Reed (@ReedReports) October 15, 2026


Benny Johnson broke it down further in this post:

FBI and Capitol Police investigating suspicious letters sent to Congress with return address linked to Democratic Socialists of America.

-Letters containing suspicious substances were mailed to congressional offices.
-Envelopes were marked “DSA” and listed a return address… pic.twitter.com/CpIspbxhSG

— Benny Johnson (@bennyjohnson) October 15, 2026




FBI and Capitol Police investigating suspicious letters sent to Congress with return address linked to Democratic Socialists of America.

-Letters containing suspicious substances were mailed to congressional offices.
-Envelopes were marked “DSA” and listed a return address previously used on Democratic Socialists of America membership forms.
-Some letters were intercepted at locations outside Congress.
-Senate staff have been warned that additional letters could still arrive.

The FBI, Capitol Police, and U.S. Postal Inspection Service are investigating.

Are DSA communists now threatening members of Congress?

In response, the Democrat Socialists of America organization denied involvement and stated that the return address is no longer where their headquarters is located.

The New York Post shared:

The Senate warning included a photo of one of the suspicious envelopes that was postmarked “DSA” and gave a return address at the same Financial District building — 75 Maiden Lane — that the Democratic Socialists of America formerly listed on their membership forms.

“DSA has not occupied this office address since 2013,” a rep for the organization said in a statement. “We are also no longer headquartered at 75 Maiden Lane.”

It was not immediately clear when DSA moved its operations out of the building.

We’ll continue to bring you further developments on the situation as they come in.

In the meantime, let us know your thoughts in the comments and be sure to share this article!

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[ H/T WLT Report ]

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