Syrian rebels seized one of the country\'s major oilfields in the eastern province of Deir Ezzor on Sunday, a first for the opposition, the Syrian Observatory for Human Rights said. \"Rebels in the Jaffar Tayyar Brigade took control of Al-Ward oilfield, east of the town of Mayadin, after a siege that lasted several days,\" the Britain-based watchdog said. \"This is the first time the rebels have taken control of an oilfield,\" Observatory director Rami Abdel Rahman stated.