premise: The latest incident in El-Fasher, the capital of North Darfur state and the main base for AU troops, came a week after five people were killed in fighting between SLM former rebels and pro-government forces.
  SLM chief Minni Minnawi threatened to quit the government over what he said were repeated attacks by the Janjaweed militia abetted by the regime of President Omar al-Beshir.
  The UN Security Council in August adopted a resolution calling for the deployment of 20,000 UN peacekeepers in Darfur, but Beshir has so far rejected such an option as well as proposals for a "hybrid" AU-UN force.
  Natsios arrived in Khartoum on Saturday in a bid to soften Khartoum's stance on peacekeepers and met Foreign Minister Lam Akol on Sunday.
  "Natsios came with the idea that Sudan had a uncompromising stance and hadn't accepted everything that was decided in Abuja," foreign ministry spokesman Ali Sadek told reporters after the meeting.
   What is referred to by the latest incident that followed the death of five people in fighting between rebels and government forces?
hypothesis: deployment of 20,000 UN peacekeepers in Darfur