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U.S. Attorney Leah Foley holds a news conference to announce the arrest of two men in connection with a weekend explosion at Harvard Medical School on Tuesday, Nov. 4, 2025 in Boston. (AP Photos/Michael Casey)

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Ted Docks, Special Agent in Charge, Federal Bureau of Investigation, speaks during a news conference to announce the arrest of two men in connection with a weekend explosion at Harvard Medical School on Tuesday, Nov. 4, 2025 in Boston..(AP Photos/Michael Casey)

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This photo provided by the Harvard University Police Department shows a person of interest in an explosion at the Harvard Medical School in Boston, on Saturday, Nov. 1, 2025. (Harvard University Police Department via AP)

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This photo provided by the Harvard University Police Department shows a person of interest in an explosion at the Harvard Medical School in Boston, on Saturday, Nov. 1, 2025. (Harvard University Police Department via AP)

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FILE - United Airlines official W.C. Mentzer points in Denver toward the reconstructed baggage compartment on Nov. 17, 1955, where officials believe the blast which caused the United Airlines plane to crash on Nov. 1, 1955. (AP Photo/Edward O. Eisenhand, File)

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White smoke billows after an explosion at KK Park online scam center in Myawaddy township, Karen State, Myanmar, Saturday, Oct. 25, 2025. (AP Photo/Sarot Meksophawannakul)

Authorities have identified the 16 people killed in a devastating blast at a rural Tennessee explosives plant last week. Investigators on Monday pledged a painstaking process to figure out what happened by gathering pieces of evidence that may now be miles apart. At a news conference, Humphreys County Sheriff Chris Davis said people in the tight-knit community probably at least knew relatives of the victims killed in the explosion Friday at the plant owned by Accurate Energetic Systems. The company supplies and researches explosives for the military and is a well-known employer in the area.

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Humphreys County Sheriff Chris Davis, right, speaks during a news conference Monday, Oct. 13, 2025, in McEwen, Tenn., at Accurate Energetic Systems. (AP Photo/Obed Lamy)

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Humphreys County Sheriff Chris Davis, right, stands beside Hickman County Sheriff J. Craft as they respond to questions from reporters at a news conference Monday, Oct. 13, 2025, in McEwen, Tenn., at Accurate Energetic Systems. (AP Photo/Obed Lamy)