An investigation has been launched after a seven-year-old girl died while in the custody of the US Border Patrol.
The Guatemalan child, named as Jakelin Caal Maquin, was detained last week after crossing the US-Mexico border with her father, officials say.
It was earlier reported that she died of dehydration, but border officials insist the pair had access to food and water while they were in detention.
A government watchdog will investigate before releasing a final report.
The migrants say they are fleeing persecution, poverty and violence in their home countries. Many say they are aiming to settle in the US despite warnings that anyone found entering the country illegally will face deportation.
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BBC