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A picture taken on May 9, 2014 shows heavily damaged buildings in the Christian neighborhood of Hamidiyeh in the old city of Homs after Syrian government forces regained control of rebel-controlled areas. The last Syrian rebels left Homs' Old City under an evacuation deal that hands the government a symbolic victory, as civilians began trickling back in to find neighbourhoods in rubble. (YOUSSEF KARWASHAN/AFP/Getty Images) ( 529620791 )

Syrians consolidate each other as they return to their house the Christian Hamidiyeh neighbourhood of the old town of Syria's central city of Homs on May 9, 2014 after the last Syrian rebels left the city's Old City under an evacuation deal that hands the government a symbolic victory. As troops moved in to clear out explosives, hundreds of civilians began returning to see what remained of their homes in the Old Town, which has been under nearly daily bombardment during a two-year siege. (AFP/Getty Images) ( 529621469 )

This photo provided by the anti-government activist group Aleppo Media Center (AMC), which has been authenticated based on its contents and other AP reporting, shows Syrian citizens forming the word Homs in Arabic with their bodies, in the Salaheddine district in Aleppo, Syria, Friday, May 9, 2014. Bulldozers cleared rubble Friday from the streets of battle-scarred districts in the central Syrian city of Homs after government troops entered the last rebel-held neighborhoods as part of an agreement that also granted opposition fighters safe exit from the city. The red placard with Arabic that reads,"no more words after Homs." (AP Photo/Aleppo Media Center AMC) ( Mideast Syria )

Syrian government forces celebrate on a tank on May 9, 2014 in the Christian neighborhood of Hamidieh in the old city of Homs after Syrian government forces regained control of rebel-controlled areas. The last Syrian rebels left Homs' Old City under an evacuation deal that hands the government a symbolic victory, as civilians began trickling back in to find neighbourhoods in rubble. (YOUSSEF KARWASHAN/AFP/Getty Images) ( 529621317 )

Syrians return to the Christian Hamidiyeh neighbourhood of the old town of Syria's central city of Homs on May 9, 2014 after the last Syrian rebels left the city's Old City under an evacuation deal that hands the government a symbolic victory. As troops moved in to clear out explosives, hundreds of civilians began returning to see what remained of their homes in the Old Town, which has been under nearly daily bombardment during a two-year siege. (AFP/Getty Images) ( 529621518 )

Syrians return to the Christian Hamidiyeh neighbourhood of the old town of Syria's central city of Homs on May 9, 2014 after the last Syrian rebels left the city's Old City under an evacuation deal that hands the government a symbolic victory. As troops moved in to clear out explosives, hundreds of civilians began returning to see what remained of their homes in the Old Town, which has been under nearly daily bombardment during a two-year siege. (AFP/Getty Images) ( 529621509 )

In this photo made on a military-led media tour, pro-government troops patrol the old city of Homs, Syria on Friday, May 9, 2014. For more than a year, these neighborhoods were rebel bastions blockaded by President Bashar Assad’s troops and pounded by his artillery and air force. But under a deal struck this week, the government assumed control of the Old City, while in return some 2,000 opposition fighters were granted safe passage to opposition areas north of Homs. (AP Photo) ( Mideast Syria )

Syrian government forces stand on a tank on May 9, 2014 in the Christian neighborhood of Hamidieh in the old city of Homs after Syrian government forces regained control of rebel-controlled areas. The last Syrian rebels left Homs' Old City under an evacuation deal that hands the government a symbolic victory, as civilians began trickling back in to find neighbourhoods in rubble. AFP PHOTO / (YOUSSEF KARWASHAN/AFP/Getty Images) ( 529620458 )

In this Wednesday, June 5, 2013 file photo released by the Syrian official news agency SANA, Syrian army troops hold up national flags in the town of Qusair, near the Lebanon border, Homs province, Syria. Two years ago, it seemed almost inevitable that President Bashar Assad would be toppled. Almost no one thinks that now. As he prepares for elections through which he is set to claim another seven-year mandate for himself, the momentum in the civil war is clearly in Assad's favor. (AP Photo/SANA, File) ( Mideast Syria War Analysis )

Syrians return to the Christian Hamidiyeh neighbourhood of the old town of Syria's central city of Homs on May 9, 2014 after the last Syrian rebels left the city's Old City under an evacuation deal that hands the government a symbolic victory. As troops moved in to clear out explosives, hundreds of civilians began returning to see what remained of their homes in the Old Town, which has been under nearly daily bombardment during a two-year siege. (AFP/Getty Images) ( 529621409 )

A Syrian resident of Homs looks at a damaged building after returning to the Christian Hamidiyeh neighbourhood of the old town of Syria's central city on May 9, 2014 after the last Syrian rebels left Homs' Old City under an evacuation deal that hands the government a symbolic victory. As troops moved in to clear out explosives, hundreds of civilians began returning to see what remained of their homes in the Old Town, which has been under nearly daily bombardment during a two-year siege. (AFP/Getty Images) ( 529621222 )

This photograph made on a military-led media tour shows damage inside the Um al-Zinar church in the old city of Homs, Syria on Friday, May 9, 2014, where bulldozers cleared rubble from the streets of battle-scarred districts in the central Syrian city after government troops entered the last rebel-held neighborhoods as part of an agreement that also granted opposition fighters safe exit from the city. (AP Photo) ( Mideast Syria )

This photograph made on a military-led media tour shows a resident of the old city of Homs, Syria carrying a photograph and a religious figurine after retrieving them on Friday, May 9, 2014. Bulldozers cleared rubble from the streets of battle-scarred districts in the central Syrian city after government troops entered the last rebel-held neighborhoods as part of an agreement that also granted opposition fighters safe exit from the city. (AP Photo) ( APTOPIX Mideast Syria )

A burnt out motorcycle is seen in front of people and Syrian government forces walking in a street on May 9, 2014 in the Christian neighborhood of Hamidiyeh in the old city of Homs after Syrian government forces regained control of rebel-controlled areas. The last Syrian rebels left Homs' Old City under an evacuation deal that hands the government a symbolic victory, as civilians began trickling back in to find neighbourhoods in rubble. (YOUSSEF KARWASHAN/AFP/Getty Images) ( 529620759 )

A road sign is seen as Syrian government forces walk in a street on May 9, 2014 in the Christian neighborhood of Hamidiyeh in the old city of Homs after Syrian government forces regained control of rebel-controlled areas. The last Syrian rebels left Homs' Old City under an evacuation deal that hands the government a symbolic victory, as civilians began trickling back in to find neighbourhoods in rubble. (YOUSSEF KARWASHAN/AFP/Getty Images) ( 529620654 )