Another unknown floating 'object' has been shot down over Lake Michigan

• Another unknown object was shot down over Lake Michigan-Huron on Sunday.
• The FAA briefly declared a "national defense airspace" over part of the lake while it was downed.
• The object was the third item shot down by the US in three days.

The Federal Aviation Administration temporarily restricted airspace above Lake Michigan on Sunday for "national defense" as a suspicious object was shot down — the third such object downed by the US in three days.