Police say it happened in the Town of Oswegatchie along State Highway 812/Mount Alone Road after 7 p.m. Wednesday.
Police say Fannie Miller, 12, and Delila Miller, 6, went to their roadside stand to wait on a customer in a white, four-door sedan. A witness told police someone in that car put something in the back and then took off.
Police have released a sketch of Fannie Miller. Police say the family has not agreed to have a sketch of Delila released to the public. Authorities cite Amish beliefs as the reasoning behind not releasing the sketch of the younger daughter. Police say the family also doesn't have photos of the daughter because of their beliefs.
The girls are described as the following:
Fannie Miller, 12, white with brown hair and brown eyes. She's approximately 5 feet tall and weighs about 90 lbs. She was last seen wearing a dark blue dress with a blue apron and black bonnet. The victim is also described as cross-eyed.
Delila Miller, 6, white with brown hair and brown eyes. She is approximately four feet tall and weighs about 50 pounds. Delila was last seen wearing dark blue dress with blue apron and black bonnet. Delila also has round scar on forehead and is missing front teeth.
Officials at the border, ICE, and the FBI have been notified.
If you have information, you are urged to call 911.