HOUSTON — An 8-year-old boy from Guatemala died in government custody in New Mexico early Tuesday, U.S. immigration authorities said, marking the second death of an immigrant child in detention this month.

The death came during an ongoing dispute over border security and with a partial government shutdown under way over President Donald Trump’s request for border wall funding.

U.S. Customs and Border Protection said the boy showed “signs of potential illness” on Monday and was taken with his father to a hospital in Alamogordo, N.M., where he was diagnosed with a cold and a fever. The boy was prescribed amoxicillin and Ibuprofen and released Monday afternoon after being held 90 minutes for observation, the agency said.

The boy was returned to the hospital Monday evening with nausea and vomiting and died there just after midnight, CBP said.

CBP has not yet confirmed when or where the father and son entered the United States or how long they were detained, saying only in its statement that the boy had been “previously apprehended” by its agents.