HAMBURG, GERMANY - OCTOBER 08:  A Kurdish protester holds a flag of PKK Chairman Abdullah Oecalan (not pictured) during a rally against IS terror on October 8, 2014 in Hamburg, Germany. Hamburg was shaken by violence during the last two nights, members of the Kurdish community and Salafists were using machetes and knifes to threaten each other.  (Photo by Alexander Koerner/Getty Images)