From the Executive Summary: "This staff report has been prepared at the request of Chairman Elijah E. Cummings to summarize the data obtained by the Committee. This information is not complete. In many respects, it is woefully inadequate in terms of the volume of information produced and the number of separated children who remain unaccounted for, and the Committee will continue to press for additional information. Nevertheless, pursuant to the subpoenas, the Committee has now obtained new information about at least 2,648 children who were separated from their parents by the Trump Administration. Many of these children were brought by their parents to the United States to seek refuge from violence in Central America and elsewhere and to seek asylum under U.S. law. This list largely covers children who were separated after the Administration initiated its 'zero tolerance policy' in April 2018 and were still in custody as of June 26, 2018. This information was provided by the Office of Refugee Resettlement (ORR) within HHS [Department of Health and Human Services], Customs and Border Protection (CBP) and Immigration and Customs Enforcement (ICE) within DHS, and other federal agencies."
U.S. Committee on Oversight and Government Reform: https://oversight.house.gov/