New video shows an armed student who police say opened fire at his university in Prague, killing at least 14 and wounding two dozen in the deadliest mass shooting in modern Czech history, Tom Soufi Burridge reports; Matt Gutman and Rob Marciano have the latest on the storm that’s bringing dangerous flash floods to parts of California amid peak holiday travel; with just weeks before the GOP caucuses in Iowa, Jon Karl has details on some of the Republican candidates taking aim at presidential frontrunner Donald Trump; and more on tonight’s broadcast of World News Tonight with David Muir.

00:00 Intro
02:19 14 killed and 2 dozen wounded at university shooting in Prague
05:29 Dangerous flash floods slam California amid holiday travel
07:58 Republican rivals take aim at Trump ahead of Iowa caucuses
10:41 Rudy Giuliani files for bankruptcy after $148M defamation judgment
12:16 U.N. says more than half a million in Gaza are starving as risk of famine increases
14:34 Texas Gov. Abbott sends over 100 migrants to Chicago via private plane
16:40 Patriots fans charged in fatal brawl at Gillette Stadium
17:06 Judge grants Lindsay Shiver permission to leave Bahamas, go home for Christmas
17:43 Honda, Toyota recall nearly 4 million vehicles combined
18:27 America Strong: Las Vegas teacher's TikTok helps fulfill Christmas wishes of over 1,000 students

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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