Free Syrian Army fighters walking through dust after a tank shell exploded outside a Syrian Army base during heavy fighting in the Arabeen neighbourhood of Damascus
File photo of Free Syrian Army fighters walking through dust after a tank shell exploded outside a Syrian Army base during heavy fighting in the Arabeen neighbourhood of Damascus February 3, 2013. Thousands of young men have left European countries to join Islamist rebels fighting in Syria. Not only are the numbers growing as the conflict drags on and President Bashar al-Assad's forces appear to be getting stronger, but those leaving are getting ever younger. Some are as young as 15 or 16. Experts at the International Centre for the Study of Radicalisation (ICSR) estimate the number of foreign fighters to have joined Islamist rebel groups fighting Assad's forces to be around 8,500, including almost 2,000 from Western Europe. TO GO WITH STORY SYRIA-CRISIS/EUROPE-JIHADISTS REUTERS/Goran Tomasevic/Files (SYRIA - Tags: CIVIL UNREST POLITICS)
File photo of Free Syria Army fighter watching from his position as smoke during a fight with forces loyal to President Bashar al Assad at the front line in Aleppo
File photo of a Free Syria Army fighter watching from his position during a fight with forces loyal to President Bashar al Assad at the front line in Aleppo December 26, 2012. Thousands of young men have left European countries to join Islamist rebels fighting in Syria. Not only are the numbers growing as the conflict drags on and President Bashar al-Assad's forces appear to be getting stronger, but those leaving are getting ever younger. Some are as young as 15 or 16. Experts at the International Centre for the Study of Radicalisation (ICSR) estimate the number of foreign fighters to have joined Islamist rebel groups fighting Assad's forces to be around 8,500, including almost 2,000 from Western Europe. TO GO WITH STORY SYRIA-CRISIS/EUROPE-JIHADISTS REUTERS/Ahmed Jadallah/Files (Syria - Tags: CIVIL UNREST POLITICS)
File photo of mural of Syria's President Assad riddled with holes on the facade of the police academy in Aleppo after it was captured by Free Syrian Army fighters
File photo of a mural of Syria's President Bashar al-Assad riddled with holes on the facade of the police academy in Aleppo, after it was captured by Free Syrian Army fighters, March 4, 2013. Thousands of young men have left European countries to join Islamist rebels fighting in Syria. Not only are the numbers growing as the conflict drags on and President Bashar al-Assad's forces appear to be getting stronger, but those leaving are getting ever younger. Some are as young as 15 or 16. Experts at the International Centre for the Study of Radicalisation (ICSR) estimate the number of foreign fighters to have joined Islamist rebel groups fighting Assad's forces to be around 8,500, including almost 2,000 from Western Europe. TO GO WITH STORY SYRIA-CRISIS/EUROPE-JIHADISTS REUTERS/Mahmoud Hassano/Files (SYRIA - Tags: POLITICS CIVIL UNREST)
Members of the media inspect the damage around lbn Khaldoun psychiatric hospital during a media tour organised by the governorate in Aleppo
Members of the media inspect the damage around lbn Khaldoun psychiatric hospital during a media tour organised by the governorate in Aleppo January 22, 2014. .REUTERS/George Ourfalian (SYRIA - Tags: POLITICS CIVIL UNREST CONFLICT MEDIA)
The empty table of the Syrian opposition is seen before peace talks in Montreux
The empty table of the Syrian opposition is seen before peace talks in Montreux January 22, 2014. International peace talks to address Syria's almost three-year-old civil war opened in Montreux near Geneva on Wednesday with a speech by U.N. Secretary General Ban Ki-moon. REUTERS/Arnd Wiegmann (SWITZERLAND - Tags: POLITICS CONFLICT CIVIL UNREST)
People celebrate in Ras Al-Ain countryside as they announced the members of the interim government of democratic self-administered party, in the city of Amuda near Hasaka
People celebrate in Ras Al-Ain countryside as they announced the members of the interim government of democratic self-administered party, in the city of Amuda near Hasaka January 21, 2014. Kurds in Syria declared a provincial government in the north of the country on Tuesday, consolidating their geographic and political presence on the eve of peace talks in Switzerland at which they will not be represented. The municipal council will run affairs in one of three administrative districts set up by Kurds, who have seized upon the chaos of Syria's civil war to assert control in the northeast of the country. Picture taken January 21, 2014. REUTERS/Rodi Said (SYRIA - Tags: POLITICS CIVIL UNREST CONFLICT)
People celebrate in Ras Al-Ain countryside as they announced the members of the interim government of democratic self-administered party, in the city of Amuda near Hasaka
People celebrate in Ras Al-Ain countryside as they announced the members of the interim government of democratic self-administered party, in the city of Amuda near Hasaka January 21, 2014. Kurds in Syria declared a provincial government in the north of the country on Tuesday, consolidating their geographic and political presence on the eve of peace talks in Switzerland at which they will not be represented. The municipal council will run affairs in one of three administrative districts set up by Kurds, who have seized upon the chaos of Syria's civil war to assert control in the northeast of the country. Picture taken January 21, 2014. REUTERS/Rodi Said (SYRIA - Tags: POLITICS CIVIL UNREST CONFLICT)
Members of the interim government of democratic self-administered party stand after declaring a provincial government, in the city of Amuda near Hasaka
Members of the interim government of democratic self-administered party stand after declaring a provincial government, in the city of Amuda near Hasaka January 21, 2014. Kurds in Syria declared a provincial government in the north of the country on Tuesday, consolidating their geographic and political presence on the eve of peace talks in Switzerland at which they will not be represented. The municipal council will run affairs in one of three administrative districts set up by Kurds, who have seized upon the chaos of Syria's civil war to assert control in the northeast of the country. Picture taken January 21, 2014. REUTERS/Rodi Said (SYRIA - Tags: POLITICS CIVIL UNREST CONFLICT)
Members of the interim government of democratic self-administered party stand after declaring a provincial government, in the city of Amuda near Hasaka
Members of the interim government of democratic self-administered party stand after declaring a provincial government, in the city of Amuda near Hasaka January 21, 2014. Kurds in Syria declared a provincial government in the north of the country on Tuesday, consolidating their geographic and political presence on the eve of peace talks in Switzerland at which they will not be represented. The municipal council will run affairs in one of three administrative districts set up by Kurds, who have seized upon the chaos of Syria's civil war to assert control in the northeast of the country. Picture taken January 21, 2014. REUTERS/Rodi Said (SYRIA - Tags: POLITICS CIVIL UNREST CONFLICT)
A passenger disembarks from a plane at Aleppo international airport
A passenger disembarks from a plane at Aleppo international airport January 22, 2014. Syria hailed the reopening of Aleppo international airport on Wednesday after a year's closure as a military victory over rebels, on the opening day of peace talks in Switzerland aimed at ending the civil war there. Syrian state television reported that a passenger flight carrying a media delegation from Damascus, 300 km (200 miles) to the south, landed at 10:30 a.m. (8:30 a.m. GMT) in Aleppo, formerly Syria's commercial hub and its most populous city. A reporter for the government outlet said the flight was made possible by the army's control of the entire area around the airport, which he said had been achieved over the past week. REUTERS/George Ourfalian (SYRIA - Tags: POLITICS CIVIL UNREST CONFLICT)