Karim Khan, the prosecutor at the International Criminal Court, told the BBC that there is no hope of peace in Sudan without some type of justice.
Mr Khan says new generations of Darfurians are being inflicted with new violence that is no fault of their own.
It follows the news that the bodies of 87 people, allegedly killed by the Rapid Support Forces were found in a mass grave in Darfur.
He says that he has seen no willingness from either side of the conflict to hand over former dictator Omar al-Bashir, who ruled the country for three decades.
Mr Khan says his office is launching a public appeal for those who have evidence of war crimes in Sudan to come forward.