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Police said the juvenile was the lone shooter and that he was taken into custody without incident.

\"PHOTO:
Steve Griffin/PA Wire via ZUMA Press via Newscom
PHOTO: Police investigate after four people were killed and a fifth person was injured in a shooting at a Grantsville, Utah, home on Jan. 17, 2020.
>

Fields told ABC News the investigation is ongoing and that because a majority of the victims are juveniles, their names won't be released at this time.

This is the 10th mass shooting in which four or more people have been killed or injured in the U.S. in 2020, according to the Gun Violence Archive, a not-for-profit that tracks shootings.

Definitions on what constitutes a mass shooting vary among organizations, but the FBI generally defines such incidents as those in which four people, excluding suspects, are killed.

ABC News' Alexandra Faul contributed to this report.

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