Hundreds of people detained at the Alligator Alcatraz immigration processing center west of Miami, Florida, appear to have vanished. They have disappeared from the Immigration and Customs Enforcement (ICE) online database, and their lawyers and families have been unable to locate them, according to immigrant advocacy groups.

“When searching for people detained there, the ICE locator now says, ‘Call the Florida Department of Corrections for details,’” says Luis Sorto of Sanctuary of the South, a network that offers legal services and participated in a lawsuit against the government over restrictions on access to lawyers for detainees at the infamous immigration jail.

All of the plaintiffs who were being held at the center were transferred to another location after a new lawsuit was filed in August challenging Florida’s authority to detain people there, Sorto added. That lawsuit also noted that the detainees did not appear in ICE’s tracking system.