About 11,000 people have crossed from Ethiopia to Sudan fleeing the conflict in their home country and an estimated 50% of them are children, a UN refugee agency official said on Thursday.
"They are coming with very, very little possessions and while most of them have actually come in in a healthy condition, we have had information on some who have been injured," UNHCR representative Axel Bisschop told reporters in a virtual briefing.
The agency had built a response plan for about 20,000 people, Bisschop said.
"We also have a further contingency for up to 100,000 people but ... it s too early to have an informed estimate of the amount of people who can actually arrive."
About 7,000 of those crossing have arrived at Hamdayat in Sudan s Kassala state, with another 4,000 arriving at Luqdi in al-Qadarif state. Most of them are Tigrayan and some 45% of them are female, said Bisschop.
One photograph of a border crossing point showed about four boats ferrying people across a river, he said.
UNHCR and local authorities have identified one site 70-100 km (43-62 miles) from the border at which to host the influx of refugees and were working to identify others, he added.
Ethiopia s military has been waging a campaign against local forces in the northern Tigray region, where air strikes and ground combat have left hundreds dead.