Syria's army has urged the last remaining rebels and civilians to leave the besieged opposition enclave in Aleppo as it prepares to take full control of the devastated city.<br/><br/>The evacuation of Aleppo's rebel sector is seen as a pivotal moment in the nearly six-year war that has killed more<br/>than 3 lakh 10 thousand people and triggered a major humanitarian and refugee crisis. <br/><br/>UN spokesman Stephane Dujarric said, the government and other parties on the ground have agreed to allow 20 observers to be sent to east Aleppo to monitor evacuations. <br/><br/>At least 25,000 people have reportedly left rebel districts of Aleppo since the operation began last week. <br/>'