Protesters set fire on barricade during riots in St. Pauli district during G 20 summit in Hamburg on July 8, 2017 . Authorities are braced for large-scale and disruptive protests as Leaders of the G20 group of nations arrive in Hamburg for the July 7-8 G20 summit.. Authorities are braced for large-scale and disruptive protests as Leaders of the G20 group of nations arrive in Hamburg for the July 7-8 G20 summit. (Photo by Maciej Luczniewski/NurPhoto via Getty Images)
