Oil lifted towards $73 by real and threatened supply cuts

LONDON (Reuters) - Oil edged higher towards $73 a barrel on Friday, supported by real and threatened supply disruptions in the Middle East and heading for a weekly gain.U.S. sanctions on Iran have cut the OPEC member's crude exports further in May, adding to supply curbs resulting from an OPEC-led pact. Meanwhile, rising tensions in the Middle East this week has raised concern about additional supply disruption.Brent crude rose 15 cents to $72.77 a barrel at 0908 GMT. The global benchmark is..