The Syrian army announced on Thursday that the country's second city Aleppo has been fully recaptured from rebel fighters, the government's biggest victory in the nearly six-year civil war.

"Thanks to the blood of our martyrs and the sacrifices of our valiant armed forces as well as allied forces... the general command of the armed forces announces the return of security to Aleppo after its release from terrorism and terrorists, and the departure of those who stayed there," the army said in a statement.