 CAIRO: Egypts President Abdel Fattah El-Sisi strongly rebuked Ethiopia on Tuesday, accusing Addis Ababa of stalling negotiations over a mega-dam being built on the Nile and moving ahead with plans to start filling the reservoir before reaching a deal.A timeline must be set to finish up negotiations, so it does not turn into a new tactic of stalling and shirking responsibility from the 2015 Declaration of Principles which all three countries agreed to, El-Sisis office said in a statement. 