The U.S. State Department has expressed concern about tensions between Ethiopia and Eritrea over their lingering border dispute.

A State Department spokesman, Adam Ereli, has urged both nations to peacefully accept the legally binding boundary commission’s report that granted the disputed town of Badme to Eritrea.

The State Department is also calling on the Eritrean and Ethiopian governments to hold talks on resolving their disagreements.

Tension has mounted between the two nations in recent weeks. Earlier this month, Eritrea banned U.N. helicopter flights in its territory and prohibited U.N. night patrol vehicles inside the border security zone. Last week, Ethiopia accused Eritrean troops of infiltrating a demilitarized zone along the border.