The Tokyo police have launched their new anti-drone squad. This group is charged with apprehending offensive law-breaking drones. In flight.
(Drone vs. Anti-Drone! Video from Japan.)
I think I've seen this future before. In his 1995 novel The Diamond Age, science fiction author Neal Stephenson wrote about a similar swarm of devices tasked with surveillance and security - the dog pod grid:
Atlantis/Shanghai occupied the loftiest ninety percent of New Chusan's land area - an inner plateau about a mile above sea level, where the air was cooler and cleaner. Parts of it were marked off with a lovely wrought-iron fence, but the real border was defended by something called the dog pod grid - a swarm of quasi-independent aerostats...
(Read more about Stephenson's dog pod grid)
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Musk Proposes Sites For Martian Cities
'...its streets were of remarkable width, with few or no buildings so high as mosques, churches, State-offices, or palaces in Tellurian cities.'