Oil prices fell Wednesday on signs that Iran was responding somewhat positively to a package of incentives by world powers hoping to curb its nuclear program.
But uncertainty over the outlook will keep a floor under oil prices, analysts said.
A researcher at Standard & Poor's in Singapore estimated that prices still included a risk premium of about US$15 per barrel.
Light sweet crude for July delivery fell 39 cents to US$72.11 a barrel in Asian electronic trading on the New York Mercantile Exchange, mid-afternoon in Singapore.
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