State police have issued a child abduction alert, also known as an Amber Alert (search) for an infant in Frederick County (search).

The girl was last seen about 8 a.m. in Mount Airy, Md., in the custody of a 40-year-old man operating a dark pickup truck with unknown Maryland tags.

The girl is identified as 9-month-old Diana Amber Jill Warren (search) and is said to be with 40-year-old Joseph Samuel Charles Warren (search).

The possible suspect vehicle is a dark blue or black pickup, with a black ladder rack with the words "Tech Roofing Incorporated" posted on the sides of the truck.