Thirteen wild burros were executed near Beatty, NV, according to a report in the Pahrump Valley Times dated 05/16/18. The animals were probably associated with the Bullfrog HMA, which has a target population of 91 (upper value of AML) and covers 157,180 acres.
See also this report dated 05/14/18 from the Fox affiliate in Las Vegas. Includes video.
Anyone with information about the event can call the BLM at 1-800-521-6501. To date, no arrests have been made in the case.
Related: Where to find burros in Nevada.
UPDATE: The following video was posted by the NBC affiliate in Las Vegas on 05/14/18.