Letter with Suspicious Substance Sent to Sen. Collins' Office in Portland

Susan Collins’ Portland office receives letter containing ‘unknown substance’

The FBI is investigating a series of similar letters sent across the country.

Letter with suspicious substance sent to Sen. Collins' office in Portland

A spokesperson for the Senate Appropriations Committee, which is chaired by Sen. Susan Collins (R-Maine), informed Maine's Total Coverage that the senator's office in Portland received a letter with a suspicious substance on Friday.

Susan Collins’ offices among targets of suspicious mailings to political figures

A Collins spokesperson said the senator’s Portland office received such a letter Friday, addressed directly to the five-term Republican.

More 'Suspicious Substance' Envelopes Arrive at Congressional Offices Across US

Suspicious substance envelopes sent to US congressional offices prompt FBI investigation nationwide.

Federal probe of letters containing suspicious substances widens as GOP senators report receiving mailings

A source familiar with the investigation says authorities are examining “dozens and dozens of letters” containing an unknown white powder.