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Here's a video of some rioters using umbrellas as cover to mask their approach and launch an attack on police.

https://www.youtube.com/watch?v=U1VdhQbfSTY&feature=youtu.be

Seems pretty effective on the ground, but the drone footage shows what they're actually up to.




Start at 2:30 - very interesting - although perhaps mostly to do with ground surveillance?




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