A second migrant child has died within a space of a month while in the custody of US Border Patrol.

An eight-year-old Guatemalan boy died of currently unknown causes, according to a statement from Customs and Border Protection (CBP).

The statement says that officials took both the unidentified child and his father to Gerald Champion Regional Medical Center in Alamogordo, New Mexico. The staff said that the child had a common cold and fever and released him with a prescription for Ibuprofen and antibiotics. He later started vomiting, and staff brought him back to the hospital, where he died on Christmas eve. Officials are awaiting a formal analysis of the cause of death.

Earlier this month in a separate incident, a seven-year-old girl from Guatemala died while in CBP custody. On Monday, her body arrived back in her rural hometown, while her father stays in the US awaiting trial.

The issue of Central American migrants has become a particularly contentious part of US politics in recent months.

President Donald Trump says that the immigrants are bringing in drugs, crimes, and diseases, which is why he says he needs to increase border security and obtain funding for a wall. Many immigrants who cross the border say that they are seeking asylum, which, if proven, would in many cases allow them to stay in the country legally.

The US government is currently shut down over disagreements about funding a small section of a wall between the US and Mexico, which Mr Trump hopes will keep out those who hope to enter the country without legal documentation

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