Jan 7, 2021 | 23:06 GMT
Workers build a fence around the U.S. Capitol on Jan. 7, 2021, in Washington, the day after supporters of U.S. President Donald Trump stormed the building.
(John Moore/Getty Images)
The violent siege of the U.S. Capitol exposed serious security flaws and the influence of online platforms in organizing protests, offering lessons for law enforcement and future demonstrators....
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