FORT WORTH, Texas -- Nearly two weeks after UFOs were reported over Stephenville, the U.S. military has offered an explanation as to the source of the mysterious lights.

Maj. Karl Lewis, a spokesman for the 301st Fighter Wing at the Naval Air Station Fort Worth Joint Reserve Base, said in a news release that an "error was made regarding the reported training activity of military aircraft" and that "10 F-16s from the 457th Fighter Squadron were performing training operations in the Brownwood Military Operating Area."