Details of the indictment are not yet clear, but media reports say Mr. Boskovski was arrested for his role in the killings of 10 ethnic Albanians during a 2001 clash with Macedonian security forces in the village of Ljubotno, near the capital of Skopje.

Officials say Mr. Boskovski was indicted with another Macedonian officer, Johan Tarulovski. It is not clear whether Mr. Tarulovski has been connected to the same incident.

The charges mark Macedonia's first indictments by the tribunal.

Mr. Boskovski is currently in jail in Croatia, where he was charged last month with trying to disguise the killing of seven economic immigrants three years ago as an anti-terrorist raid. He has denied all allegations.