One year ago al Qaeda-linked militants attacked Kenya's Westgate Mall. During the two-day rampage they killed 71 people and injured hundreds of others. There were more than 100 security cameras rolling. Director Dan Reed used that video to retell the frightening story of the attack in his new documentary "Terror at the Mall." He told Anderson this was the most videoed attack in history.
Watch a clip of "Terror at the Mall" below.
Anderson Cooper goes beyond the headlines to tell stories from many points of view, so you can make up your own mind about the news. Tune in weeknights at 8 and 10 ET on CNN.
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