CHEYENNE, Wyo. (AP) — The U.S. Department of Energy is withholding records involving a Wyoming carbon-capture project on the grounds that a legal investigation is underway and that releasing documents could compromise the probe.

The carbon-capture study at the site of the Two Elk Energy Park, about 15 miles east of Wright in the Powder River Basin, got almost $10 million in economic stimulus grants from the Energy Department.