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A child, age 7, has died in custody of the U.S. Border Patrol.

The Washington Post is reporting that a migrant child from Guatemala has died from dehydration and shock eight hours after she and her family were apprehended by Border Patrol agents. She was part of a group of 163 migrants that had crossed the border. She and her father were arrested on December 6, at 10 PM.

As the newspaper reports, “More than eight hours later, the child began having seizures at 6:25 a.m., CBP records show. Emergency responders, who arrived soon after, measured her body temperature at 105.7 degrees, and according to a statement from CBP, she ‘reportedly had not eaten or consumed water for several days.’”

Speaking on Fox and Friends, Homeland Security Secretary Kirstjen Nielsen said the story “is a very sad example of the dangers” of migrants entering the United States. She added that, “My heart goes out to the family.”

In response, Senator Dick Durbin of Illinois tweeted:

The ACLU issued a blistering condemnation of the government. “The fact that it took a week for this to come to light shows the need for transparency for CBP,” Cynthia Pompa of the ACLU told The Washington Post. “We call for a rigorous investigation into how this tragedy happened and serious reforms to prevent future deaths.” She added that the incident was due to a “lack of accountability, and a culture of cruelty within CBP.”