(Bulgarian nationalist supporters and football fans shout slogans during a protest rally in the city of Plovdiv, some 120 km (75 miles) east of Sofia February 14, 2014. REUTERS/Stringer )

Bulgarian police detained more than 120 people on Friday after hundreds of nationalists and soccer fans attacked a mosque in the country’s second city Plovdiv, smashing its windows with stones.

Over 2,000 people had gathered outside a Plovdiv court as it heard an appeal case dealing with the return of an ancient mosque in the central city of Karlovo, taken over by the state more than 100 years ago, to Bulgaria’s Chief Mufti, the Muslim religious authority.

The rally then marched through the city and some protesters, chanting racist slogans, approached a Plovdiv mosque cordoned off by police, police said in a statement.

“Firecrackers, torches and stones were thrown at the mosque. One policeman was injured. Some 120 people were detained,” it said.