Rep. Mike Quigley’s Chicago office received a suspicious package. His staff notified Chicago police and U.S. Capitol Police and evacuated the office. Quigley’s spokesperson said the congressman and staff were safe and were cooperating with federal, state and local investigators. The office was later cleared to return, a spokesperson said.

At Rep. Brad Schneider’s office in Lincolnshire, staff received at least one threatening letter containing a suspicious substance. The office said mail is opened under a protective hood. After contacting Capitol Police and Lincolnshire police, staff and local responders, including a hazardous-materials team, tested the letter and found no harmful substances.

Rep. Robin Kelly said one of her district offices received an envelope with a suspicious substance Friday afternoon. Rep. Jan Schakowsky’s Skokie office also received a suspicious envelope; her staff said they identified it after a warning from the House sergeant at arms and did not open it. Skokie police and Capitol Police responded.

A notice to Senate offices said law enforcement was working to intercept additional letters, but warned that some could still reach their destinations. Deputy Postal Inspector Brendan Donahue said threats against election officials were unacceptable and that investigators were working with partner agencies to identify those responsible.

The mailings arrived about three weeks before Election Day, raising concern about possible disruption to election-related work. In 2023, election offices in six states received mail containing white powder, and some incidents interrupted local election operations. Authorities had not publicly identified who sent the current mailings or established a motive.