The United Nations says three Eritrean refugees were killed, including two children, when an airstrike hit a refugee camp Wednesday in Ethiopia’s northern Tigray region. The U.N. did not say who was responsible for the assault, but Ethiopia’s military has the only air force in the area. Ethiopia’s government has repeatedly denied targeting civilians throughout its 14-month-old war in Tigray. Aid workers and witnesses say at least 146 people have been killed and over 200 injured in airstrikes in Tigray since mid-October.