The Trump administration announced Thursday that federal authorities have located approximately 146,000 unaccompanied migrant children who entered the United States during the Biden administration and were later placed with sponsors, while officials say close to 300,000 children have yet to be found.

The figures were revealed during a press briefing at the Justice Department in Washington by Acting Attorney General Todd Blanche and Homeland Security Secretary Markwayne Mullin. Officials said the number of children successfully located has risen dramatically from roughly 22,000 identified last summer.

“We found 146,000 kids so far — 146,000 kids. We still have nearly 300,000 missing,” Mullin said.

Mullin sharply criticized the previous administration’s management of unaccompanied minors, arguing that failures in oversight and monitoring resulted in hundreds of thousands of children effectively disappearing after being released into the country.

“When we start digging into these cases, and you start hearing the absolute horrific things that took place underneath the Biden administration, either true neglect at best and criminal at worst, to allow 450,000 kids to go missing throughout this country,” Mullin said.

Administration officials said that more than half a million unaccompanied migrant children crossed the southern border and entered the United States during the Biden administration without a parent or legal guardian accompanying them.

After arriving in the country, the minors were placed under the supervision of the Department of Health and Human Services before eventually being released to sponsors residing in the United States.

The Trump administration has made tracking down those children a major priority, directing multiple federal agencies to work together to determine where they are living and whether they are being properly cared for.

Officials declined to offer specifics about the methods used to locate the 146,000 children or provide a timeline for finding those who remain unaccounted for. They also did not disclose additional details regarding the condition or circumstances of the children who have already been identified.