Police arrested a mother and her boyfriend after they found an 8-year-old girl with a brain disorder locked in a homemade cage at their New Mexico home. KTSM's Jessica Munoz reports.

Police in New Mexico found an 8-year-old girl locked in a cage in a darkened mobile home, authorities said on Tuesday, adding that they charged the girl's adoptive mother, who had gone to the movies, with child abuse.

Cindy Patriarchias, 33, and her boyfriend, Edmond Gonzales, 37, were arrested after police found the caged girl on Friday evening, Las Cruces Police Department spokesman Dan Trujillo said.

He said police, acting on a tip from the woman's estranged husband, found the girl in the corner of a bedroom locked inside the cage, about 4 feet high, slightly more than 2 feet wide and about 5 feet long.

The homemade wooden structure had two latches and a baby crib mattress on the floor, Trujillio said.

He said Patriarchias had been charged with one count of negligent child abuse while Gonzales was charged with one count of negligently permitting child abuse. Patriarchias was released on bond on Tuesday but her boyfriend was still being held Wednesday, authorities said.

Las Cruces Police Department / AFP - Getty Images Cindy Patriarchias, 33, and Edmond Gonzales, 37, are charged with leaving Patriarchias' 8-year-old adoptive daughter in a cage while they went out to see a movie.

The girl was seen by medical personnel but showed no visible signs of physical abuse. She apparently suffers from microcephaly, a condition in which the head or cranial capacity is abnormally small, Trujillo said.

He said detectives did not know why the girl was left locked in the cage. She and three of Patriarchias' other children had been placed in state custody, he said.