Mayor of Srebrenica has accused Serb authorities of using the pretext of investigating Islamic extremists to harass Muslims who returned to the town following the country's 1992-95 war.

Camil Durakovic, himself a Muslim Bosniak, said Thursday Serb police stormed returnees' homes and arrested people without explanation. He called it a "form of repression."

Bosnian Serb police on Wednesday raided a few dozen locations and detained 30 people, including two in Srebrenica, on suspicion of links with Islamic extremists.

The operation comes after a Muslim gunman killed one policeman and wounded two others as he stormed into a police station in northeast Bosnia yelling "Allahu akbar" last week. Investigators believe the 24-year-old gunman was linked to Islamic extremists.

Serbs killed more than 8,000 Bosnian Muslims in Srebrenica in 1995.