A man is in custody Sunday morning after three adults were killed in Poplar, the Fort Peck Tribal Law Enforcement said in a Sunday news release.

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Michael J. Littlebull was arrested in connection to the three homicides, according to a tribal police Facebook post .

Law enforcement declined to give any additional details on the killings or the events surrounding the arrest. The case is currently being investigated by the Fort Peck Tribal Police, Federal Bureau of Investigation, Yellowstone County Sheriff's Office and Roosevelt County Sheriff’s Office.

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