Ian Pannell reports on the new video of retaliatory U.S airstrikes in Syria after American troops in the region were targeted, and has details on the high-level negotiations underway to release hostages being held by Hamas; Aaron Katersky has the latest on the threatening letters – some containing fentanyl – that were sent to election offices in at least 5 states; Victor Oquendo reports on the two Florida deputies fighting for their lives after a driver allegedly hit them with his car intentionally, in what authorities are calling an “ambush”; and more on tonight’s broadcast of World News Tonight with David Muir. 00:00 Intro 02:07 Video of retaliatory U.S airstrikes in Syria released 04:51 FBI investigating “suspicious” letters - some containing fentanyl - sent to election offices 06:53 Orlando-bound flight takes off from London with damaged windows 08:09 Florida deputies in critical condition after "ambush attack," police say 09:50 College freshman dies after being hit by stray bull...