Syria conflict: Foreign jihadists 'use Turkey safe houses'
7 December 2013 Last updated at 12:50 GMT
Foreign jihadist fighters are using safe houses in southern Turkey to cross into Syria to fight against government forces, the BBC has learnt.
The route through Turkey used by al-Qaeda-linked foreign jihadists is now becoming increasingly organised.
Opposition activists say jihadists are destroying the Syrian revolution.
Richard Galpin reports from Turkey.