Authorities are investigating letters containing “suspicious substances” sent to multiple Capitol Hill offices, according to a notice sent to senior congressional staff.

“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,” says a memo from the Senate Sergeant at Arms and obtained by POLITICO.

The Capitol Police, FBI and U.S. Postal Inspection Service are involved in the probe, according to the notice, which said additional letters have been mailed to other addresses across the U.S., including lawmakers’ state and district offices.

It is unclear if any of the suspicious letters reached Capitol Hill. Letters and packages sent to congressional offices are subject to off-site screening under a system established after the 2001 anthrax attacks.

The memo includes a photo of one of the suspicious envelopes and warns staff to keep an eye out for warning signs, such as messy handwriting or postmarks that do not match the return address. The memo was first reported by Bloomberg Government.

Suspicious letters were also sent to state election offices and election officials, according to a joint statement Wednesday from the National Association of Secretaries of State and National Association of State Election Directors.

They said they are working with law enforcement to protect “personnel and facilities” and that contingency plans and security measures are in place to respond to threats “while maintaining essential election operations.”

House and Senate mail is processed in two separate Maryland facilities where materials are screened, irradiated and tested for a variety of substances before they are sent to the Capitol complex — a process that can add as much as two weeks to delivery.

The process has proved effective in the past, catching a string of suspected explosive devices sent to prominent Democrats in 2018 and a ricin-laced envelope sent to Sen. Roger Wicker (R-Miss.) in 2013.

Members’ district and state offices have the option to send mail for screening before it is delivered or to contract with a similar mail security system.

Jordain Carney contributed to this report. 

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