Reuters | Oil higher on Middle East, North Sea supply worries Reuters LONDON (Reuters) - Oil prices rose on Monday on worries over supply after tensions worsened between Iran and the United States, while some offshore workers began a 24-hour strike on three oil and gas platforms in the British North Sea. Oil slips amid increasing concern about demand Oil steady after G20 warns of risks to growth Oil prices fall on demand concerns as G20 warns of risks to growth |