The indictment says that Boskoski committed the crimes together with another three high-ranking Macedonian Interior Ministry officials and an external associate. He has been in remand prison in Pula since September 1, 2004.
County Prosecutor Vlatko Nuic said that Boskoski was charged with making and carrying out a plan to kill the economic migrants in order to show the United States that Macedonia had joined in the international fight against terrorism.
Nuic said that important evidence had been gathered during a comprehensive investigation showing that Boskoski had killed the seven immigrants and that they were not terrorists.
Macedonian police recorded a conversation with the alleged terrorist group at the beginning of February 2002 and made the recording available to the US and British ambassadors.
Nuic said that the transfer of the immigrants from Bulgaria to Skopje had been organised by the Macedonian police and that the immigrants were then detained in an apartment owned by the Interior Ministry.
The indictment says that the economic migrants were taken to a Skopje suburb on March 2, 2002 where they were killed in a police ambush. The immigrants were unarmed.
Nuic said that after the immigrants were murdered, guns were placed in their hands to give an impression that they had been killed in a firefight with the police. He also said that after the killings Boskoski rewarded his accomplices.
Nuic requested an extension of detention for Boskoski, which will be decided by the Trial Chamber.
Boskoski, who holds dual Macedonian and Croatian citizenship, fled to Croatia last year.