A new two-day round of negotiations between Egypt, Ethiopia and Sudan ended in Cairo on Tuesday with no resolution to their years-long dispute over Addis Ababa’s building of a mega-dam on the Blue Nile, which threatens water security, the neighbours say. The next round of talks will be held in the Ethiopian capital, Egypt's Ministry of Water Resources and Irrigation said. Another round of talks was held in Addis Ababa in September which also ended with no resolution to the dispute. READ MORE Why even failed talks over Ethiopia's Gerd dam are a good thingIn between August and September's talks, Addis Ababa announced it had completed the fourth and final filling of the dam's 74 cubic-kilometre reservoir. Ethiopia has maintained that it is well within its rights to build the hydroelectric dam on the Blue Nile, which originates in Lake Tana.