The Times has found listings for 50 of the men in the U.S. immigration service’s Detainee Locator, which allows the public to search for people by name.

Until recently, the men had been listed as being held by Immigration and Customs Enforcement in El Paso. U.S. cargo planes began moving migrants to Guantánamo, and the agency switched their locations to “Florida.” Detainee operations at Guantánamo Bay are overseen by the U.S. Southern Command, which is near Miami, and the overall base is supervised by Navy headquarters in Jacksonville, Fla.

As of Wednesday, the military had brought about 100 migrants to Guantánamo. The people who are not named on the list were being held in a separate facility.