Afghanistan Falls to the Taliban; U.S. Adds Forces to Help Evacuate Kabul

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KABUL (CBS News) -- A Defense Department official said Sunday that 1,000 troops are being sent to the airport in Kabul, Afghanistan, as the capital city neared closer to falling into Taliban hands. The stunning development unfolded rapidly on Sunday as Afghan President Ashraf Ghani fled Kabul and the U.S. evacuated Americans from the country.