Suspicious Mail Sent to Congressional Offices Prompts FBI Investigation
Letters containing unknown substances were sent nationwide, with some bearing a return address linked to the Democratic Socialists of America.
Federal law enforcement agencies are investigating a series of suspicious letters containing unknown substances that were mailed to congressional offices across the country. The U.S. Senate Sergeant at Arms alerted senior Capitol Hill staff on Thursday to the nationwide mailing, warning that some letters may have already reached their intended destinations.
The FBI, U.S. Postal Inspection Service, and U.S. Capitol Police are collaborating on the investigation. While declining to confirm specific details, an FBI spokesperson stated that the agencies are working to intercept any additional letters and identify the responsible parties. "Some of the letters contained an unknown substance, and we are working closely with our law enforcement partners to respond to each incident," the spokesperson said.
One of the envelopes included in the Senate Sergeant at Arms' notice featured a return address associated with the Democratic Socialists of America's (DSA) national headquarters in New York City. It remains unclear if the DSA has any connection to the mailings. Fox News Digital reached out to the DSA for comment but had not received a response.
Staff were advised to treat all suspicious letters, packages, or substances as potentially hazardous. This incident occurs on the 25th anniversary of the 2001 anthrax attacks, which involved letters laced with anthrax sent to several news media offices and two Democratic U.S. senators, killing five people and infecting hundreds more.