A UN convoy has arrived in rebel-held areas in eastern Democratic the Republic of Congo, carrying aid for people affected by recent fighting.
The convoy brought medicine to the town of Rutshuru. Food is expected later.
But aid workers found that refugee camps that had held tens of thousands are now virtually empty. It is believed many people left fearing attacks.
Last week rebels led by Laurent Nkunda routed the Congolese army near Goma, the capital of North Kivu province.
A fragile ceasefire is now in place, and Gen Nkunda has said he will guarantee "humanitarian corridors" for the convoy through rebel lines.
However, according to AFP news agency, Gen Nkunda also said on Sunday he would drive the government from power unless it agreed to direct talks.
The agency reported that the government had again rejected the demand.
The 12-vehicle convoy, escorted by UN troops, arrived in Rutshuru, carrying medical supplies and water purification tablets, but not desperately needed food.
The BBC's Peter Greste, travelling with the convoy, says UN workers are now in talks with local leaders.
The BBC's Peter Greste saw the convoy arrive
Our correspondent says the UN will try to find out where tens of thousands of people housed in refugee camps have gone. On its journey, the convoy passed the large Kibumba camp, just north of Goma, and all the buildings were flattened, he says.
The area around Rutshuru is relatively calm but reports of fresh clashes in the region on Sunday night have cast doubts on whether the truce will hold, he adds.
The UN said it hoped food convoys could follow.
"We are sending a team to see if it is possible to bring things to Rutshuru in the coming days," said the World Food Programme's Theo Kapuku.
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