The body of Savanna Greywind, who was eight months pregnant, was found wrapped in plastic in the Red River on Sunday

Police said a body found in a North Dakota river on Sunday is that of a 22-year-old woman who was eight months pregnant when she went missing earlier this month in Fargo, North Dakota, police confirmed in a press conference.

Savanna LaFontaine-Greywind‘s body was found wrapped in plastic in the Red River near Harwood, North Dakota, just before 6 p.m., Fargo Police Chief David Todd announced in a Sunday night news conference, according to CBS News.

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Authorities said kayakers first spotted the remains and called police, CBS reports. Police were also investigating a nearby farmstead, which authorities said may be a crime scene.

Fargo police did not immediately respond to a request for comment from PEOPLE.

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The gruesome discovery comes more than a week after LaFontaine-Greywind vanished from her apartment building in Fargo on Aug. 19. Days after she went missing, police found who they believed to be her newborn daughter — allegedly with her neighbors.

William Henry Hoehn, 32, and 38-year-old Brooke Lynn Crews were arrested on suspicion of conspiracy to commit kidnapping in connection with LaFontaine-Greywind’s disappearance.

Police said then that Crews’s and Hoehn’s apartment is in the same building where LaFontaine-Greywind lives with her parents and 16-year-old brother.

Both LaFontaine-Greywind’s cause of death and the manner in which she may have given birth remain unclear.

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Hoehn and Crews allegedly gave police information that led them to believe the baby is LaFontaine-Greywind’s child but are not answering questions about the young woman’s whereabouts, police have said.

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Hoehn and Crews remained in jail on Monday and it is unclear whether they have entered pleas or retained attorneys.

LaFontaine-Greywind was last seen that Saturday after a woman living in a third-floor apartment knocked on her family’s basement door, asking LaFontaine-Greywind if she would model a dress the woman was sewing, the Forum News Service reported.

The expectant mother agreed, left the apartment without her wallet and never returned.

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“I immediately knew something was wrong because [my daughter’s] car is here,” her mother told the Forum News Service.