Sue says…

Brooklyn Bridge white flag mystery: a political statement or a prank?

From the article:

New York police and counterterrorism officials are looking closely at a video of the Brooklyn Bridge that apparently shows the moment when two huge American flags that were flying over the bridge were replaced with white flags.

http://www.americanthinker.com/blog/2014/07/brooklyn_bridge_white_flag_mystery_a_political_statement_or_a_prank.html