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April 29, 2016

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In this Sunday, March 30, 2014 photo, a drone flies during a mock protest as police train for World Cup security in Brasilia, Brazil. Brazil will host the soccer tournament starting in June.

Eraldo Peres / AP Photo

In this Sunday, March 30, 2014 photo, a drone flies during a mock protest as police train for World Cup security in Brasilia, Brazil. Brazil will host the soccer tournament starting in June.