Local, state and federal officials were called when a letter allegedly containing ricin was sent to Sen. Susan Collins (R) home in Maine.

Collins' Communications Director, Annie Clark, took to Twitter to explain what occurred:

Senator Collins’s husband, Tom Daffron, today received a threatening letter that the writer claimed was contaminated with ricin, a highly hazardous substance which was used in a previous attack against the United States Senate. (1/4) — Annie Clark (@annieclark25) October 16, 2018

Mr. Daffron, their dog, and parts of their home were quarantined while the crime lab undertook an analysis of the premises. The affected areas have now been cleared, and Senator Collins and Mr. Daffron will be able to remain at home tonight. (2/4) — Annie Clark (@annieclark25) October 16, 2018

The affected areas have now been cleared, and Senator Collins and Mr. Daffron will be able to remain at home tonight.



The testing of the letter, as well as the investigation into its origins, remain ongoing. (3/4) — Annie Clark (@annieclark25) October 16, 2018

Today’s incident is the latest in a series of threats against Senator Collins, her loved ones, and her staff. (4/4) — Annie Clark (@annieclark25) October 16, 2018

A picture of the scene appeared on Twitter:

Bangor PD Bangor fire have closed down Hayward street investigating a possible threat to Senator Susan Collins pic.twitter.com/mmVdY2C4BY — David Simpson (@vidmandave) October 15, 2018

Collins was not home when the letter was received. She arrived at home around 7:45 p.m., after most of the police had cleared the scene, Bangor Daily News reported.

Collins released a joint statement with her husband, Tom Daffron:

We are very grateful for the immediate and professional assistance that we received from the Bangor Police Department, the Maine Crime lab, the Maine State Police Department, the Capitol Police, the FBI, the Orono Hazmat Unit, the Bangor Fire Department, the U.S. Army, and the U.S. Postal Inspection Service. We are also truly appreciative of the many well wishes that we received today. Our friends and neighbors have been incredibly kind and have even offered to open their homes to us. We feel blessed to live in such a supportive community.

It is unclear whether or not the letter was a direct result of her vote in favor of Justice Brett Kavanaugh. According to the Bangor Daily News, Collins has had protestors outside of her home but has continued to live a normal life without increased security.

As of Monday night, law enforcement personnel were analyzing the letter's contents and its origin. Preliminary tests indicate the substance was no threat to the public, Fox News reported.