SARAJEVO, June 3 (Reuters) - Bosnian police arrested four suspected members of an organised crime gang on Tuesday and were hunting nine more in a crackdown following the murder last week of a Sarajevo gang boss.

Local media reported the gang members, all but one ethnic Albanians, were suspected of involvement in contract killings and racketeering.

"Police detained four suspects during raids on 19 residences and business premises believed to be used by the gang in the area of Sarajevo, Zenica and Gorazde," the Interior Ministry of Bosnia's Muslim-Croat federation said in a statement.

Police said that among those on the run was the prime suspect in the murder of mafia boss Ramiz Delalic, who was gunned down at the entrance to his apartment building on June 27 in an apparent settling of accounts.

The killing was the latest in a string of shootings of underworld figures in Sarajevo.

Delalic, a Bosnian Muslim, was one of several crime bosses who helped defend Sarajevo against Bosnian Serb forces during the 1992-95 war, and occasionally singled out ethnic Serb civilians for punishment, sometimes killing them.

At the time of his death, he was on trial for the March 1992 killing of a man during a Serb wedding in downtown Sarajevo, an episode that many Bosnian Serbs say triggered the war.

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