STRASBURG, Colo. -- Authorities have arrested a woman in connection with the discovery of a baby's decomposing body found in the back of a truck in Arapahoe County, Colo.

The discovery was made just before 8 p.m. in a mobile home park south of the town of Strasburg.

A man told Arapahoe County investigators that he and his 15-year-old son were removing trash left in the back of the pickup truck when they found the body of an infant boy in a box. He said he had bought the older-model truck just hours earlier from a family that lives in a mobile home nearby.

A woman in that family, who has not yet been identified, was arrested for investigation of first-degree murder, and child abuse resulting in death. Arapahoe County Sheriff Grayson Robinson told KMGH-TV in Denver that they consider the case a murder investigation and that there may be others involved in the case who may be arrested at a later date.

Authorities are searching the family's home for additional clues. Neighbors said that the family has lived there since January 2005 and they are shocked by the allegations.

The boy's body was sent to the coroner's office for an autopsy.