What's 9/11? Afghans never heard of NYC terror

Images from 9/11 are still chilling, even 10 years after the attacks shook the world. They triggered the so-called war on terror. But in the country that's been at the forefront of that war, it can be hard to find people who remember why foreign troops arrived in the first place. We continue our special coverage of the 9/11 anniversary, with this report from Afghanistan.
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