Authorities say a woman may be headed to South Dakota with her four children who are not in her custody.
The Montana Department of Justice issued a Missing/Endangered Person advisory Tuesday at the request of the Helena Police Department.
The agency identified the mother as 36-year-old Jennifer Marie Raymond. She is 5 feet, 4 inches tall and 150 pounds.
The children are two sets of twins. Melena Marie Frost and Rena Ruth Frost are 7 years old, and each is 4 feet, 1 inch tall and 50 pounds.
Therron Joseph Frost and Tanner Lane Frost are 8 and the same height and weight as their sisters.
Authorities say Raymond may be driving a blue 2003 Honda Pilot with Montana license plate 5C-78145 and may be headed to Spearfish, S.D.