In 2020, U.S. officials reported that a small drone, or autonomous aerial vehicle (UAV), attempted the first known attack of its type on a utility power substation. Officials said the UAV, equipped with copper wire hanging from nylon cords, was meant to short circuit transformers or distribution lines at a Pennsylvania location. Fortunately, the drone, stripped of its identifying markings and internal memory card, fell short of the target. However, it shows the vulnerability of utility sites to relatively inexpensive aerial attacks.