Federal Judge Kathleen Cardone granted a preliminary injunction Friday to halt construction on the border wall in Texas’ expansive Big Bend sector, including the national and state parks.

Cardone read a brief order from the bench after hearing more than four hours of testimony from conservation groups and residents of the Big Bend region, known internationally for its dark night skies, abundant biodiversity and rugged river canyons.

Cardone said that the plaintiffs are likely to succeed on the merits in at least one of their claims and to suffer irreparable harm if construction continues. Her ruling stops border barrier construction in the entire Big Bend sector—which spans more than 500 miles across West Texas—until the federal government complies with all applicable laws.