Former Belgrade spy agency head Milan Radonjic is accused of planning the killing of journalist Slavko Curuvija outside his apartment in the capital in April 1999, and former operations chief Ratko Romic of taking part in the assassination. Deputy Prime Minister Aleksandar Vucic said formal charges will be filed against them by March.
The killing took place during a NATO air war against Serbia over the independence-seeking province of Kosovo.
Serbia's public prosecutor, Miljko Radisavljevic, said today the initial investigation shows that the former chief of Milosevic's secret service, Rade Markovic, ordered the killing, while Romic and another agency operative, Miroslav Kurak, were the assassins.
Markovic, not related to Mirjana Markovic, is serving a 40-year prison sentence for the killings and attempted murders of other Milosevic's political opponents, while Kurak is on the run.
Vucic, who was Serbia's information minister when Curuvija was killed, hailed the arrests of Radojic and Romic as a major accomplishment of the new Serbian government.
Milosevic died in his prison cell at the UN war crimes tribunal in the Hague, Netherlands, in 2006. Mirjana Markovic fled to Russia after his ouster, and she was given political asylum there.