The assassination came only hours after the U.N. Security Council voted Monday to monitor the evacuations from eastern Aleppo. The resolution passed unanimously. Russia had threatened to veto an earlier version of the plan. The Red Cross says 25,000 people have already been evacuated from eastern Aleppo since last week, when it fell to advancing Syrian government forces backed by Russian airstrikes. The Red Cross estimates thousands of civilians remain to be evacuated. On Tuesday, Syrian soldiers reportedly broadcast messages over loudspeakers calling on anti-government rebels to leave eastern Aleppo. Last week, the U.N. acused Syrian government troops of shooting at least 82 civilians on sight, amid the fall of the city.