The woman accused of taking a baby from a Minneapolis apartment building may be in the United States illegally.
Isabel Diaz-Castillo, 30, remains in custody at the Hennepin County Jail awaiting charges.
U.S. Immigration and Customs Enforcement is now involved in the investigation and placed an "immigration detainer" on Diaz-Castillo.
"ICE places detainers only on non-U.S. citizens who are eligible for deportation," the department said in a statement obtained by KARE 11.
The suspect's brother, Israel Diaz-Castillo, tells WCCO that their family is originally from Mexico.
If Diaz-Castillo posts bond, immigration officials will likely take her into custody.
The woman was arrested after 8-month-old Carlos Orozco was abducted in the 2100 block of Portland Avenue South, prompting an Amber Alert that identified Diaz-Castillo as the perpetrator.
The baby was eventually found unharmed about four hours later, just two miles south of where he went missing. Police spotted Diaz-Castillo in her car and she attempted to flee. She was eventually taken into custody.
Family members said Wednesday that the suspect and the boy's mother met a few months ago and Diaz-Castillo had developed an infatuation with the infant.