4-year-old Macey Lilley was abducted on Friday night, according to police. Authorities say John "Billy" Lieba, right, is a suspect.

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NEW: "She was found alive and well," spokesman says

4-year-old Maci Lilley was abducted Friday night

CNN  — 

A 4-year-old girl who disappeared in Montana was found alive on Sunday, a spokesman with the Roosevelt County Sheriff’s Office said.

Maci Lilley was abducted Friday night from a housing complex in Wolf Point.

“She was found alive and well,” said Lee Allmer, the spokesman. “At the moment, we cannot divulge the location (where she was found) as the investigation is ongoing.”

Allmer said the girl was undergoing a medical evaluation “as a precautionary measure.”

A suspect is in custody.

Authorities say people saw John “Billy” Lieba, 20, take the girl against her will. Both are Native Americans.

The FBI has taken control of the investigation, and several local and federal agencies participated in the search effort.