Darfur on the brink?

There are serious predictions of an impending bloodbath. Kofi Annan is trying to get UN troops in but the Sudanese government won't cooperate. They've even thrown out the AU troops that they said they had no objection to. According to the very reliable BBC the AU has agreed to get out. But according to the VoA Nigeria is sending more troops without asking the Sudan's permission. The Sudanese government, on the other hand, is launching a major new offensive.