From ABC News.

While a motive in the Annunciation School mass shooting remains under investigation, Alex Perez has the new video showing the chaos inside the church as gunfire erupted during Mass and the father of the 8-year-old killed in the attack speaks out; Mary Bruce has the latest on the dozens of workers who walked out and the four top officials that resigned in protest at the Centers for Disease Control and Prevention following the ousting of the agency’s director; Victor Oquendo has details on the horrific alligator attack in New Orleans that police say has left a missing 12-year-old boy dead; and more on tonight’s broadcast of World News Tonight with David Muir.

00:00 Intro
02:10 Investigators search for motive in Minneapolis shooting as parents condemn "coward" killer
07:26 Top CDC officials resign in protest over the ousting of the agency’s director
10:02 Newark Airport flights grounded over ATC issues during start of busy Labor Day weekend travel
11:43 Russia launches one of its largest attacks against Ukraine; more than 20 killed
13:12 Alligator attack kills missing 12-year-old New Orleans boy, police say
14:16 Ostapenko denies racism accusations after heated exchange with Townsend at US Open
16:07 New Jersey boy escapes house fire by leaping from 2nd floor into arms of police, neighbor
16:24 CDC warns of salmonella outbreak in recalled Sunshine Yolk eggs
16:51 George Clooney cancels appearances at Venice Film Festival due to illness
17:10 Powerball jackpot now worth $950 million ahead of Saturday night’s drawing
17:33 America Strong: Adult grandchildren gift grandma trip to Hawaii after she took all 16 on one-on-one trips

ABC World News Tonight with David Muir delivers the news that matters most. Watch to get the latest news stories and headlines from around the world.

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