US border authorities confirmed Wednesday that an eight-year-old girl died while in their custody along the US southern border. Her death is the second reported incident of a child dying in US custody since the lifting of Title 42, a Trump-era immigration policy that has been widely criticized by human rights groups.

A statement from US Customs and Border Protection (CBP) stated the girl and her family were held in a US Border Patrol facility in Harlingen, Texas. There, the girl “experienced a medical emergency.” Emergency personnel transported the girl to a local hospital where she was pronounced dead. The Office of Professional Responsibility (OPR), a government watchdog, has already launched an investigation into the girl’s death.

Border authorities warned of this potential harm in court filings last week. The filings stem from a ruling from a federal judge in Florida, which went into effect the same day that Title 42 expired. The ruling requires border officials to retain migrants in custody until they receive a notice from an immigration court to hear their asylum claims. Prior to the ruling, because of overcrowding at federal border facilities, border officials had released migrants without notice, requesting that they instead report at a later time to an immigration office.

In response to the judge’s ruling, border authorities stated that they were left with “only inferior options” for handling migrants along the US’s southern border. They warned, “The most immediate consequences of the court’s orders will likely be overcrowding in detention facilities…[which] inflicts harm on migrants.” While the CBP did not explicitly state the girl’s death was due to overcrowding, a Department of Homeland Security (DHS) official told CNN on April 29 that detention facilities along the southern border had surpassed their capacity.

Last Friday, another migrant died while in US authorities’ custody. The 17-year-old Honduran died in a resettlement shelter in Florida. Their death is also under investigation.