CARRIZO SPRINGS, Texas (AP) — A former oilfield worker camp off a dirt road in rural Texas has become the U.S. government's newest holding center for detaining migrant children after they leave Border Patrol stations, where complaints of overcrowding and filthy conditions have sparked a worldwide outcry.

Inside the wire fence that encircles the site are soccer fields, a giant air-conditioned tent that serves as a dining hall, and trailers set up for use as classrooms and as places where children can call their families.

The long trailers once used to house workers in two-bedroom suites have be...