4 fighter jets just flew over full afterburner on flew west then NW then circled back east then southeast then west again then NW then WSW now north full afterburner last 20 min like they're chasing something. Loud very very loud and low but can't see for the clouds. They're still flying now came over ver low again heading south. Don't know what they're chasing but very odd flight patterns and full afterburners and flying low. Made my heart pound it was so loud. The direction changes were speratic and quick. Might check out Lackland Air Force Base tower logs to see what it is.