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A mortar that belongs to the Free Syrian Army fighters, is pictured attached to a car to be pulled to the front line where clashes with forces loyal to Syria's President Bashar al-Assad are taking place, in Binnish in Idlib province March 13, 2013. REUTERS/Mohamed Kaddoor/Shaam News Network/Handout ( SYRIA-CRISIS/ )

Members of the Free Syrian Army work on an improvised mortar shell in Deir al-Zor March 8, 2013. REUTERS/ Khalil Ashawi ( SYRIA-CRISIS/ )

A homemade military vehicle called Sham 1 is seen in Khan al-Assal area November 10, 2012. Picture taken November 10, 2012. REUTERS/Zain Karam ( SYRIA-CRISIS/ )

Members of the free Syrian Army use a catapult to launch a homemade bomb during clashes with pro-government soldiers in the city of Aleppo, October, 15, 2012. REUTERS/Asmaa Waguih ( SYRIA/ )

Free Syrian Army fighters prepare a homemade missile before they launch it towards the military airport in north Aleppo December 23, 2012. REUTERS/Ahmed Jadallah ( SYRIA-CRISIS/ )

A man works on an improvised mortar shell for the Free Syrian Army inside a factory which previously manufactured steel and iron in Aleppo February 18, 2013. REUTERS/Hamid Khatib ( SYRIA-CRISIS/ )

A Free Syrian Army fighter makes homemade missiles at a workshop in north Aleppo December 29, 2012.REUTERS/Ahmed Jadallah ( SYRIA-CRISIS/ )

Syrian rebel fighters stand around a cache of homemade missiles which they say they use on forces loyal to president Bashar al-Assad in Aleppo province August 21, 2012. The rebels say they get explosive materials from government shells which failed to explode. REUTERS/Youssef Boudlal ( SYRIA-CRISIS/ )

Free Syrian Army fighters stand next to a home-made rocket launcher in Sermeen near Idlib, October 17, 2012. REUTERS/Shaam News Network ( SYRIA-CRISIS/ )

Members of the Free Syrian Army prepare a home-made bomb during clashes with pro-government forces in the city of Aleppo, October 17, 2012. REUTERS/Asmaa Waguih ( SYRIA-CRISIS/ )

Free Syrian Army fighters launch a home made bomb using a catapult during clashes in Aleppo October 20, 2012. REUTERS/Zain Karam ( SYRIA-CRISIS/ )

Free Syrian Army fighters stand by a homemade military vehicle called Sham 2 in Khan al-Assal area November 10, 2012. Picture taken November 10, 2012. REUTERS/Zain Karam ( SYRIA-CRISIS/ )

A Free Syrian Army fighter makes homemade missiles at a workshop in north Aleppo December 29, 2012. REUTERS/Ahmed Jadallah ( SYRIA-CRISIS/ )

Syrian brothers who used to be musicians make homemade explosives for the Free Syrian Army in the Ma'ar Shamarine village near Idlib January 15, 2013. REUTERS/Ghaith Taha ( SYRIA-CRISIS/ )

A Free Syrian Army fighter uses a shotgun to fire a homemade grenade at Syrian Army soldiers during a fight in Arabeen neighborhood of Damascus January 24, 2013. REUTERS/Goran Tomasevic ( SYRIA-CRISIS )

A Free Syrian Army fighter uses a catapult to fire a homemade grenade at Syrian Army soldiers during a fight in the Arabeen neighborhood of Damascus January 24, 2013. REUTERS/Goran Tomasevic ( SYRIA-CRISIS )

A Free Syrian Army fighter uses a shotgun to fire a homemade grenade at Syrian Army soldiers during a fight in the Arabeen neighborhood of Damascus January 24, 2013. REUTERS/Goran Tomasevic ( SYRIA-CRISIS )

Free Syrian Army fighters use a homemade catapult in old Aleppo, January 29, 2013. REUTERS/Zain Karam ( SYRIA-CRISIS/ )

Free Syrian Army fighters use a catapult to launch a handmade grenade during clashes with forces loyal to Syria's President Bashar al-Assad, in the Aleppo district of Salaheddine February 12, 2013. Picture taken February 12, 2013. REUTERS/Aref Hretani ( SYRIA-CRISIS/ )

A man sits near parts of an improvised mortar shell produced for the Free Syrian Army inside a factory which previously manufactured steel and iron in Aleppo February 18, 2013. REUTERS/Hamid Khatib ( SYRIA-CRISIS/ )

A Free Syrian Army member smokes a cigarette inside a factory producing improvised mortar shells for the Free Syrian Army, which previously manufactured steel and iron, in Aleppo February 18, 2013. REUTERS/Hamid Khatib ( SYRIA-CRISIS/ )

A Free Syrian Army fighter holds an improvised mortar shell inside a factory which previously manufactured steel and iron in Aleppo February 18, 2013. REUTERS/Hamid Khatib ( SYRIA-CRISIS/ )

Combination photo of members of the Free Syrian Army using a catapult to launch a homemade bomb during clashes with pro-government soldiers in the city of Aleppo, October 15, 2012. REUTERS/Asmaa Waguih ( SYRIA/ )