More immigrants are being locked up alone. And the practice is growing.

Immigration detention centers are holding more people in solitary confinement than had been believed, and the practice is growing.

New data show thousands more immigrants were held in solitary confinement under the Biden administration than had been reported, and the use of "segregation" tactics remains high under the Trump administration – despite the documented dangers to human health.

"The more data that is released the worse we realize it is," said Dr. Katherine Peeler, medical adviser for Physicians for Human Rights and assistant professor of pediatrics at Harvard Medical School.

The Trump administration has dramatically increased the use of ICE detention amid a nationwide immigration crackdown. Roughly 60,000 people are in ICE detention now on any given day, up from fewer than 40,000 people this time last year.

The number of people placed in solitary has risen at the same time, but so too has their share of the overall detained population, according to the new report by the nonprofit Physicians for Human Rights and Harvard University researchers.