[1]https://www.wweek.com/news/2020/06/15/a-mysterious-plane-circled-over-portlan d-protests-for-hours-the-u-s-marshals-service-wont-say-if-its-theirs/ References 1. https://www.wweek.com/news/2020/06/15/a-mysterious-plane-circled-over-portland-protests-for-hours-the-u-s-marshals-service-wont-say-if-its-theirs/