Syrian rebels outgunned by the regime 's military forces . Fighters are exposed to Iraqi insurgent and suicide bombs . `` These are the explosive devices , they are all made locally , '' Captain Daoud Hassan Mahmoud explains , crouching down and pointing to the metal cylinders , perhaps just 20cm in diameter -- Devices made from pipes packed with fertilizer , cement and nuts and bolts .
Syrian rebels outgunned by the regime 's military forces . Fighters are exposed to Iraqi insurgent and suicide bombs . Devices made from pipes packed with fertilizer , cement and nuts and bolts .