Flags taken from Brooklyn Bridge to be returned to NYPD

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(CNN) -- Two American flags that were taken from the Brooklyn Bridge are now in the United States and are expected be returned to the New York Police Department Friday, a law enforcement official tells CNN.

The NYPD said they believe a pair of German artists was behind the theft and then placed two white flags on the bridge, the official added.

The investigation in to the July 22 incident is ongoing and it's still unclear what, if any charges, the artists will face, according to the official.

In the words of the artists -- Matthias Wermke and Mischa Leinkauf -- the replacement of the Stars and Stripes fluttering above the bridge with two massive white flags last month was nothing more than an "art project" by the two performance artists meant to deal with "questions of historical legacy and art in the public sphere."