Bosnian police arrested eight ethnic Serbs yesterday suspected of taking part in the killings of around 120 Muslim men and boys at the start of the 1990s war, prosecutors said.The eight men are suspected of a role in the "illegal detention and killing" of the Muslims, including 15 boys, in the northwestern area of Prijedor in July 1992, the national prosecutor's office said.At the time the suspects were members of a local crisis committee, police and the armed forces, it said in a statement. Bosnian Serb military chief Ratko Mladic is currently standing trial in a UN court in The Hague which is nearing its end.