“Jabhat al-Nusra is investing in the Syrian economy to reinforce its position in Syria and Iraq. Al-Nusra fighters are selling everything that falls into their hands from wheat, archaeological relics, factory equipment, oil drilling and imaging machines, cars, spare parts and crude oil,” Abu Saif, a fighter with the Ahrar Brigade, linked to the Muslim Brotherhood, told the Guardian by phone from the Deir Ezzor area.
http://www.guardian.co.uk/world/2013/may/19/eu-syria-oil-jihadist-al-qaida