A U.S. Marine has been released from custody after being questioned about a missing 14-year-old girl discovered in the Oceanside, California, barracks of Camp Pendleton, the Marine Corps said Monday.

The news comes after the Marine was detained late last month when the minor was found at the base. Neither the girl nor the Marine has been named.

Investigators believe that the teen had run away from the home of her grandmother, who reported her missing June 13. After her discovery on June 28, she was returned to her grandmother’s care.