Thousands of people have fled violence in northern Ethiopia, where the government said it’s killed at least 550 fighters in a week of clashes with forces loyal to the Tigray region’s rebellious ruling party.

Almost 7,000 refugees have arrived at Ethiopia’s border with Sudan, some of them combatants, said Ann Encontre, a country representative for the United Nations Refugee Agency. The authorities are registering people before allowing them to travel to a refugee camp in the southeastern Sudanese town of Gedaref, she said by phone Wednesday.

Officials are "disarming combatants before letting them in,” Encontre said.