A hazardous materials team was called Monday to investigate a suspicious letter sent to the home of Republican Sen. Susan Collins, officials said.
Police and fire vehicles were parked outside her home, and several people in hazmat suits were seen entering the home. Yellow police tape was wrapped around the perimeter of the property.
The senator's husband, Thomas Daffron, was at home, but Collins wasn't there at the time.
"She's on her way home," said Collins' spokeswoman Annie Clark.
Critics have vowed Collins will face a tough re-election race in 2020 for voting to confirm Supreme Court nominee Brett Kavanaugh.
It was unclear who sent the letter and why. Bangor Police Sgt. Wade Betters said the public isn't believed to be in any danger.
Contents of the letter were being analyzed by law enforcement officials.
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