Katie Ledecky wins 1,500-meter freestyle and 8th gold medal; Supporters of Hamas and Hezbollah call for revenge after killings of leaders; Wildfires explode in Colorado, killing at least one person and forcing evacuations; and more on tonight's broadcast.

Team USA wins medals in track, sailing and swimming; Joy and gratitude as Americans freed by Russia arrive home; Acting Secret Service head says warning about would-be Trump assassin never reached agents; and more on tonight's broadcast.