Mysterious fog sweeping US sparks fears of 'Operation Sea Spray'

A thick, 'mysterious' fog has descended upon a wide swath of the US, sparking fears of another 'Operation Sea Spray.'

For one week in September of 1950, the US Navy sprayed massive amounts of bacteria into the air two miles off the coast of San Francisco, .

The aim of this secret was to learn how vulnerable large US cities like San Francisco would be to a biowarfare attack by terrorists.

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