Jennifer Abrahamson, a spokeswoman for the UN Office for the Coordination of Humanitarian Affairs, said government troops blockaded the gates to Kalma on Friday after its inhabitants killed an alleged member of the Janjaweed.
The UN's special representative to Sudan, Jan Pronk, said in a statement on Sunday that he was "very concerned that since three days the UN and humanitarian workers have been denied access to Kalma camp, which will have serious consequences on the ... needs for relief and assistance."
Pronk had asked his deputy and other official to visit the camp yesterday.
On Sunday, Ismail presented Pronk with a list of extra actions being carried out by the Sudanese government to secure areas in Darfur.
Pronk welcomed the steps, but said in the statement that the "crucial phase will be the one when it could be demonstrated that these actions have borne fruit on the ground."
Pronk expressed concern about the lack of progress registered so far on the ground and at the fact that Janjaweed were still active around the camps and continued to be a threat.
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