FBI and Capitol Police Investigate Suspicious Letters Sent to Congressional Offices

• Multiple letters containing suspicious substances were mailed to congressional offices across the country.
• The U.S. Postal Inspection Service, FBI, and U.S. Capitol Police are investigating the incident.
• The letters have a return address linked to the Democratic Socialists of America (DSA).
• Senior Capitol Hill staff were warned about the suspicious mail on Thursday.
• The investigation is ongoing to determine the cause and contents of the suspicious substances.