After accusing Sudan's president of genocide, the chief prosecutor of the International Criminal Court sought arrest warrants Thursday for three anti-government rebel leaders accused of a deadly attack on African Union peacekeepers in northern Darfur.

Luis Moreno-Ocampo alleged the rebel commanders planned and led an attack in September 2007 by about 1,000 heavily armed rebels on the Haskanita camp in Sudan's Darfur region that left 12 peacekeepers dead and eight wounded.

He has accused the rebels of committing war crimes, including murder, pillaging and deliberately attacking peacekeepers.

Rights groups welcomed the announcement as a sign that the international community will not tolerate attacks on peacekeepers.

"Civilians rely on peacekeepers for protection, and any hope for restoring security for civilians in Darfur depends on peacekeepers being able to do their job," Richard Dicker, director of the International Justice Program at Human Rights Watch, said in a statement.