Suspicious powder letters kept arriving through the weekend, WMTW and Utah News Dispatch reported Monday. Chellie Pingree, a Maine Democrat, said her Portland office received a suspicious letter Monday morning "consistent with" those sent to other congressional and election offices, WMTW reported. Portland police and firefighters and the FBI responded, and US Capitol Police were notified, according to Pingree's statement carried by WMTW. Her office is at 2 Portland Fish Pier, WMTW reported. The mailing came three days after Republican Senator Susan Collins' Portland office received a letter with a suspicious substance, WMTW reported.

In Utah, Lieutenant Governor Deidre Henderson said in a social media post that on Sunday a local postal inspector intercepted a letter with white powder addressed to her and handed it to the FBI before it reached her office, Utah News Dispatch reported. "Nothing is going to disrupt the midterm election," she wrote, according to the Dispatch. Henderson's office was also sent a white-powder letter in September 2024, Utah News Dispatch reported.

No suspect has been named. WMTW cited an October 15 FBI statement carried by the Associated Press saying the FBI and the US Postal Inspection Service are investigating suspicious mailings sent nationwide, including to secretary of state and election offices, and that some letters contained an unknown substance. Utah News Dispatch said Utah is "among at least 5 states" sent letters, a count that differs from broader tallies reported earlier on the live powder-letters card. Both figures are attributed, not merged. No counted outlet says the Pingree or Henderson powders were lab-tested or harmless.

What we know: Pingree's Portland office reported a suspicious letter Monday, and a powder letter to Henderson was intercepted Sunday for the FBI.
What we don't: Who sent the letters, or what lab tests show for the Pingree and Henderson mailings.