An enormous Palestinian flag was unfurled from the south side of the Manhattan Bridge earlier this evening as protesters marched across the nearby Brooklyn Bridge to protest Israeli attacks in Gaza. The flag, which bore writing that read "Boycott, Divest, Sanction," hung from the bridge for at least 30 minutes before it was removed.

The march began in Brooklyn at Cadmen Plaza and was bound for NYPD headquarters, where, organizers say, a demonstration would draw "attention to the unequivocal support of Israel by NYC’s political elite, despite overwhelming condemnation from the international community... connecting Palestinian resistance to Israeli aggression to recent struggles in the U.S. against highly militarized police departments. Many of these same police departments have trained and shared 'tactics' with the Israeli government, including the New York City and St. Louis, Missouri Police Departments, most recently on display in Ferguson, Missouri."

As of 7:30 p.m., NYPD helicopters were still circling the Manhattan Bridge and the Brooklyn Bridge. The incident occurred weeks an embarrasing security breach for the NYPD on the Brooklyn Bridge, where two German artists successfully planted two giant white flags on each of the bridge's towers.

For more on tonight's demonstration, follow along on Twitter with reporter Nick Pinto.

The Palestine march reaches the eastern pier of the Brooklyn Bridge: pic.twitter.com/agy3VeT5hh — Nick Pinto (@macfathom) August 20, 2014

Update, August 21: According to the NYPD, three people believed to be protesters were arrested and charged with disorderly conduct in the East Village. No one has been arrested in connection with the Manhattan Bridge flag drop, but cops are investigating.