However, most of the changes had very little effect on a return of more than a million refugees. Intimidation of returnees were quite common and occasionally escalated into violent riots as in the case of Ferhadija mosque riots in Banja Luka in 2001. Consequently, the views concerning Republika Srpska are different among various ethnic groups within the Bosnia and Herzegovina. For Serbs, the Republika Srpska is a guarantee for their survival and existence as a people within these territories. On the other hand, for some ethnic Bosniaks, who were ethnically cleansed from Republika Srpska, the creation, existence, name and insignia of this entity remains a matter of controversy.