A Syrian man walks through the former rebel-held Salaheddin district in the northern Syrian city of Aleppo on December 23, 2016 after Syrian government forces retook control of the whole embattled city. Syrian troops cemented their hold on Aleppo after retaking full control of the city, as residents anxious to return to their homes moved through its ruined streets. (Photo by George Ourfalian/AFP Photo)





A convoy, evacuating civilians and opposition group members who left east Aleppo that had been under siege by Assad regime and its supporter foreign terrorists, arrive in opposition controlled Rashideen Town of Aleppo, Syria on December 22, 2016. (Photo by Mahmoud Faisal/Anadolu Agency/Getty Images)





A Syrian man rides his motorbike past damaged buildings covered with snow on December 18, 2016, in a rebel-held district of Homs. (Photo by Mahmoud Taha/AFP Photo)





Syrians walk in a snow covered street in the town of Maaret al-Numan, in Syria's northern province of Idlib, on December 21, 2016. Rebels and civilians who have sought refuge in the opposition-held province of Idlib, most recently from second city Aleppo, say they are suffering from skyrocketing prices and overpopulation. At least 25,000 people, including rebel fighters, have left east Aleppo since last week under an evacuation deal that will see the city come under full government control. (Photo by Mohamed al-Bakour/AFP Photo)





A burnt car is pictured in a rebel-held sector of eastern Aleppo, Syria December 17, 2016. (Photo by Abdalrhman Ismail/Reuters)





People walk past a billboard depicting Syria's President Bashar al-Assad at Saadallah al-Jabri Square, in the government controlled area of Aleppo, Syria December 17, 2016. (Photo by Omar Sanadiki/Reuters)





Women take a selfie outside Aleppo's historic citadel, in the government controlled area of the city, Syria December 17, 2016. (Photo by Omar Sanadiki/Reuters)





People sit inside a damaged vehicle as they take a selfie at the entrance of the Carlton Hotel, in the government controlled area of Aleppo, Syria December 17, 2016. (Photo by Omar Sanadiki/Reuters)





Women pose for a picture at the entrance of the Carlton Hotel, in the government controlled area of Aleppo, Syria December 17, 2016. (Photo by Omar Sanadiki/Reuters)





Women take a selfie outside Aleppo's historic citadel, in the government controlled area of the city, Syria December 17, 2016. (Photo by ZUMA Press/Alamy Stock Photo)





People leave the Umayyad mosque, in the government controlled area of Aleppo, Syria December 17, 2016. (Photo by Omar Sanadiki/Reuters)





People walk past a shrine protected by cement blocks inside the Umayyad mosque, in the government controlled area of Aleppo, Syria December 17, 2016. (Photo by Omar Sanadiki/Reuters)





People walk amid the rubble as they carry belongings that they collected from their houses in the government controlled area of Aleppo, Syria December 17, 2016. (Photo by Omar Sanadiki/Reuters)





People carry belongings as they walk on the rubble of damaged buildings in the government controlled area of Aleppo, Syria December 17, 2016. (Photo by Omar Sanadiki/Reuters)





People walk past the old customs buildings (L) and Peoria restaurant (R) near Aleppo's historic citadel, in the government controlled area of the city, Syria December 17, 2016. (Photo by Omar Sanadiki/Reuters)





People take pictures in front of the old Customs building in the government controlled Old City of Aleppo, Syria December 17, 2016. (Photo by Omar Sanadiki/Reuters)





A member of forces loyal to Syria's President Bashar al-Assad stands with a civilian on the rubble of the Carlton Hotel, in the government controlled area of Aleppo, Syria December 17, 2016. (Photo by Omar Sanadiki/Reuters)





A man reacts at Khan al-Jumruk entrance in the government controlled Old City of Aleppo, Syria December 17, 2016. (Photo by Omar Sanadiki/Reuters)





A man on a motorcycle drives past burning buses while en route to evacuate ill and injured people from the besieged Syrian villages of al-Foua and Kefraya, after they were attacked and burned, in Idlib province, Syria December 18, 2016. (Photo by Ammar Abdullah/Reuters)





Rebel fighters and civilians gather near damaged buildings as they wait to be evacuated from a rebel-held sector of eastern Aleppo, Syria December 18, 2016. (Photo by Abdalrhman Ismail/Reuters)





A girl rides in a bus to be evacuated from a rebel-held sector of eastern Aleppo, Syria December 18, 2016. Picture taken December 18, 2016. The reflection on the window shows a damaged building. (Photo by Abdalrhman Ismail/Reuters)





Women carry their belongings as they wait to be evacuated from a rebel-held sector of eastern Aleppo, Syria December 18, 2016. (Photo by Abdalrhman Ismail/Reuters)





Rebel fighters warm by a fire in a rebel-held sector of eastern Aleppo, Syria December 18, 2016. (Photo by Abdalrhman Ismail/Reuters)





Rebel fighters and civilians walk in a rebel-held sector of eastern Aleppo, Syria December 18, 2016. (Photo by Abdalrhman Ismail/Reuters)





A rebel fighter stands with his weapon near evacuees from the Shi'ite Muslim villages of al-Foua and Kefraya as they ride bueses in insurgent-held al-Rashideen, Syria December 20, 2016. (Photo by Ammar Abdullah/Reuters)





Evacuees from a rebel-held area of Aleppo arrive at insurgent-held al-Rashideen, Syria December 21, 2016. (Photo by Ammar Abdullah/Reuters)





A man drives a vehicle with a blanket used instead of a broken windshield at insurgent-held al-Rashideen in the province of Aleppo, Syria December 22, 2016. (Photo by Ammar Abdullah/Reuters)





A rebel fighter stands near vehicles at insurgent-held al-Rashideen in the province of Aleppo, Syria December 22, 2016. (Photo by Ammar Abdullah/Reuters)





Evacuees from the Shi'ite Muslim villages of al-Foua and Kefraya ride a bus at insurgent-held al-Rashideen in the province of Aleppo, Syria December 22, 2016. (Photo by Ammar Abdullah/Reuters)





People ride a car with hanged mattresses at insurgent-held al-Rashideen in the province of Aleppo, Syria December 22, 2016. (Photo by Ammar Abdullah/Reuters)





Gifts are seen near damaged buildings during Christmas eve in al-Hamidiyah neighbourhood in the old city of Homs, Syria December 24, 2016. (Photo by Omar Sanadiki/Reuters)





People walk under Christmas decorations during Christmas eve in al-Hamidiyah neighborhood in the old city of Homs, Syria December 24, 2016. (Photo by Omar Sanadiki/Reuters)





People gather by a Christmas tree near damaged buildings during Christmas eve in al-Hamidiyah neighbourhood in the old city of Homs, Syria December 24, 2016. (Photo by Omar Sanadiki/Reuters)





A Christmas tree lights near damaged buildings during Christmas eve in al-Hamidiyah neighbourhood in the old city of Homs, Syria December 24, 2016. (Photo by Omar Sanadiki/Reuters)





People gather by a Christmas tree near damaged buildings during Christmas eve in al-Hamidiyah neighbourhood in the old city of Homs, Syria December 24, 2016. (Photo by Omar Sanadiki/Reuters)





A Christmas tree lights near damaged buildings during Christmas eve in al-Hamidiyah neighbourhood in the old city of Homs, Syria December 24, 2016. (Photo by Omar Sanadiki/Reuters)





A Syrian boy sits with belongings he collected from the rubble of his house in Aleppo's Al-Arkoub neighbourhood on December 17, 2016, after pro-government forces retook the area from rebel fighters. (Photo by Youssef Karwashan/AFP Photo)





Syrians build a snowman, during a storm that brought snow, heavy rain and high winds, in the Syrian town of Binnish, on the outskirts of Idlib, on December 21, 2016. (Photo by Omar Haj Kadour/AFP Photo)





Syrians work at a factory making wood-burning stoves in the rebel-held town of Douma, on the eastern outskirts of Damascus on December 19, 2016. As the weather in Douma is getting colder, wood is the most affordable source of heating for residents. (Photo by Sameer Al-Doumy/AFP Photo)





Syrians walks down a destroyed street in Aleppo's al-Akroub neighbourhood on December 17, 2016. (Photo by Youssef Karwashan/AFP Photo)





Syrians evacuated from the embattled Syrian city of Aleppo during the ceasefire arrive at a refugee camp in Rashidin, near Idlib, Syria, Tuesday, December 20, 2016. Russian Foreign Minister Sergey Lavrov said on Tuesday that Russia, Iran and Turkey are ready to act as guarantors in a peace deal between the Syrian government and the opposition. He spoke on Tuesday after a meeting of the three countries' foreign ministers in Moscow. (Photo by AP Photo)





A Syrian child evacuated from the embattled Syrian city of Aleppo during the ceasefire arrives at a refugee camp in Rashidin, near Idlib, Syria, Tuesday, December 20, 2016. (Photo by AP Photo)





An injured Syrian arrives at a refugee camp in Rashidin, near Idlib, Syria, after was evacuated from the embattled Syrian city of Aleppo during the ceasefire, Tuesday, December 20, 2016. (Photo by AP Photo)





Syrians evacuated from the embattled Syrian city of Aleppo during the ceasefire arrive at a refugee camp in Rashidin, near Idlib, Syria, Tuesday, December 20, 2016. (Photo by AP Photo)





Armed Syrian fighters evacuated from the embattled Syrian city of Aleppo during the ceasefire arrive at a refugee camp in Rashidin, near Idlib, Syria, Tuesday, December 20, 2016. Russian Foreign Minister Sergey Lavrov said on Tuesday that Russia, Iran and Turkey are ready to act as guarantors in a peace deal between the Syrian government and the opposition. He spoke on Tuesday after a meeting of the three countries' foreign ministers in Moscow. (Photo by AP Photo)