I heard a strange airplane-like noise outside of my house, and it seemed awfully too loud to be an airplane. I ran outside an noticed a strange square/triangle craft hovering very slowly and noticeably very low over my house. I proceeded to fly over to the soccer field where the kids were currently having soccer practice. You could also hear the awe the kids as well as the adults were in as the craft flew over. Three helicopters then appeared to circle the sky around our neighborhood about 10 minutes later.