Ethiopia has banned all flights over its giant new hydropower dam on the Blue Nile for "security reasons", the head of its civil aviation authority said on Monday.
Ethiopia is locked in a dispute with Egypt and Sudan over its $4 billion Grand Ethiopian Renaissance Dam, which Cairo has said could threaten its main supply of water.
"All flights have been banned to secure the dam," the director-general of the Ethiopian Civil Aviation Authority, Wesenyeleh Hunegnaw, according to Reuters. He declined to give more details on the reasons.
Last week, air force chief Major General Yilma Merdasa told local media that Ethiopia was fully prepared to defend the dam from any attack.
Ethiopia, Egypt, and Sudan failed to strike a deal on the operation of the Grand Ethiopian Renaissance Dam before Ethiopia began filling the reservoir behind the dam in July.
The structure is about 15 km (9 miles) from the Ethiopian border with Sudan on the Blue Nile - a tributary of the Nile river, which gives Egypt´s 100 million people about 90% of their freshwater.