EDWARDSVILLE, Ill. (AP) — Prosecutors in southern Illinois have filed kidnapping and child abduction charges against a 39-year-old man they say took his 13-year-old stepdaughter and her infant son.

Police haven’t located Christopher M. Derleth, his stepdaughter Katherine Elizabeth Derleth and her son, Christopher Ray Derleth. He’s previously been ordered not to contact the girl. Madison County prosecutors announced the charges Monday. The three went missing over the weekend. Officials say the girl and baby were taken from a home in the town of Carpenter, north of Edwardsville.

Authorities say the baby was born Sept. 1. Sheriff John Lakin said authorities are worried because the infant is so young and the girl gave birth not long ago.

Authorities think they’re possibly headed to West Virginia in a green minivan.