Pierre Thomas has the latest on the gunman that opened fire on two armed National Guard members blocks from the White House in what officials have called a targeted attack, the latest on their condition as Rachel Scott reports on Pres. Trump ordering an additional 500 National Guard troops to the nation's capital in the wake of the shooting; Alex Perez has the latest on the bumper to bumper traffic as millions race to get home while Lee Goldberg times out the two massive storms that could threaten holiday travel with blinding snow and rain from the Dakotas to the Northeast; James Longman reports on the urgent rescue efforts underway for the more than 250 people unaccounted for after a devastating fire ripped through a high-rise apartment complex in Hong Kong, killing at least 36; and more

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