Three employees of the Danish Refugee Council (DRC) were killed in a conflict in the Ethiopian region of Tigray in late November, the organization said on Friday.
The three had worked as security guards as part of a DRC aid project in the region, but the circumstances of their death remain unclear, the humanitarian organization added.
The conflict in Tigray began last month when Ethiopian Prime Minister Abiy Ahmed deployed troops to put down an uprising by a regional political organization, the TPLF.
The TPLF had long dominated Ethiopian politics, but since taking office in 2018, reformist Abiy has been at odds with the elites in Tigray.
Both sides have reported bloodshed, but an internet blackout and blocked telephone lines make it difficult to get a sense of what is happening on the ground in Tigray.
The DRC said the blackout meant that the families of the slain security guards - reportedly Ethiopian nationals - have yet to be contacted about the incident.
Hundreds have reportedly been killed and tens of thousands of Ethiopians fleeing the fighting have now entered neighbouring Sudan.