Oil lifted to $73 by real and threatened supply cuts

LONDON (Reuters) - Oil edged higher to $73 a barrel on Friday, supported by a host of supply cuts and concern of further disruption to Middle East shipments as tensions rise, and was 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 tension in the Middle East this week has raised concern about additional supply disruption.Brent crude was up 43 cents to $73.05 a..