A network of Syrian mosques is sending men, money and weapons to Iraq, fuelling the insurgency.
An investigation by the Telegraph has shown that Arab volunteers are streaming across the border despite Damascus government claims that it is curbing cross-border terrorism.
Insurgents can earn £1,600 a month fighting in Iraq
Much of the traffic is financed by former members of Saddam Hussein’s regime living in the Syrian capital and has the backing of prominent tribal leaders