Serbian police have arrested 11 people over hate-motivated acts in France and Germany, including defacing Jewish sites and placing pig heads near mosques, authorities said Monday. "Their objective was also to spread ideas advocating and inciting hatred, discrimination and violence based on differences," the statement said. Nine heads of pigs, considered impure in Islam, were found in early September outside mosques in Paris and the surrounding region, sparking outrage and alarm over rising-anti-Muslim hatred. Three Serbs have since been charged and jailed in France as part of the investigation. The group of 11 will be brought before the prosecutor on a range of offences, including racial discrimination and espionage.