Episode 320

Martha Raddatz has new details on the closed door briefing from Adm. Mitch Bradley to lawmakers on the Sept. 2 strikes on an alleged drug boat in the Caribbean Sea that killed both survivors; after a nearly five-year investigation, Pierre Thomas reports on the arrest in connection with the pipe bombs planted outside DNC and RNC headquarters before the Jan. 6 attack on the U.S. Capitol; David Muir looks back on the life and legacy of Steve Cropper, a guitarist, songwriter and producer who helped shape the sound of Memphis soul music; and more on tonight's broadcast of World News Tonight with David Muir.