The northern Sinai desert was ablaze early Thursday morning...br The cause, an explosion in a natural gas pipeline that carries fuel between Egypt, Israel and Jordan.br Sources say improvised explosive devices were put under the pipeline and were detonated from a distance.br A message in the sand, apparently left by the assailants read: "We will not allow gas exports to Israel".br The pipeline has been a target for attacks by anonymous saboteurs since the overthrow of President Hosni Mubarak in February.br Egypt and Israel have signed a 20-year natural gas deal that is largely unpopular with the Egyptian public.br This is the sixth pipeline explosion incident since Mubarak was overthrown.