Several Darfur rebel groups are meeting in Sudan's southern city of Juba in an attempt to find a common negotiating position with the government.
The government blames the violence on rebel groups
At least seven rebel factions have gathered, in advance of peace talks due in Libya later this month.
But the BBC's Amber Henshaw in Sudan says the sheer number of rebel groups from Darfur is causing problems for the organisers of the Libya talks.
There are at least a dozen groups, each with their own demands and grievances.
More factions are expected to join the talks in the next day or so.
One rebel leader questioned whether the Khartoum government still had the authority to go to the Libya talks, following the withdrawal from the cabinet of its main coalition partner, the southern SPLM.
Representatives from the Justice and Equality Movement, and at least five representatives of different Sudan Liberation Army factions are in Juba for the pre-talks being hosted by the southern government.
This could be the rebels last chance to find a common position ahead of the talks which are due to start a week on Saturday.
Peace talks in 2006 failed to end the four-year conflict which have seen some two million people displaced and caused at least 200,000 deaths.