Slain peacekeepers were from Senegal . Similar ambush killed up to 300,000 Sudanese peacekeepers in July . Secretary-general calls on Darfur to apprehend attackers . Decade of conflict in Sudan has killed almost 3 million , displaced almost 3 million .
Slain peacekeepers were from Senegal . Similar ambush killed 7 Tanzanian peacekeepers in July . Secretary-general calls on Sudan to apprehend attackers . Decade of conflict in Darfur has killed up to 300,000 , displaced almost 3 million .