Serbia’s interior ministry accused the suspects of "inciting hatred", citing the involvement of a "foreign intelligence service".
Serbian police have arrested 11 people accused of "inciting hatred" in France and Germany, including by placing pigs' heads near mosques and throwing paint at a Holocaust museum, authorities said on Monday.
The group of Serbian nationals were allegedly trained by another suspect, "acting under the instructions of a foreign intelligence service," who is "currently on the run," the interior ministry said in a statement, without specifying their nationality.
"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.
In late April, the Holocaust Memorial, three synagogues and a restaurant in Paris were defaced with green paint.
Three Serbs have since been charged and jailed in France as part of the investigation.
Read More:
The group of 11 will be brought before the prosecutor on a range of offences, including racial discrimination and espionage.
The arrests took place in Serbia's capital, Belgrade, and in Velika Plana, a town about 100 kilometers (60 miles) to the south, in coordination with the security services.
Source: France 24