At least 10 people were killed and dozens more injured when a massive rock formation broke off a cliffside in Brazil, crushing boats below. NBC News’ Priscilla Thompson explains that there were previous hints of a possible collapse. Warning: The video you are about to see may be disturbing.  » Subscribe to NBC News: http://nbcnews.to/SubscribeToNBC » Watch more NBC video: …

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NBC News’ Richard Engel is with Ukrainian troops as they prepare for the worst while the U.S. and Russia hold high-stakes negotiations in Geneva. Though Russia’s representative said there are no plans to invade, it has more than 100,000 troops positioned near Ukraine’s borders.» Subscribe to NBC News: http://nbcnews.to/SubscribeToNBC » Watch more NBC video: http://bit.ly/MoreNBCNews NBC News Digital is a …