Oil prices retreated from three-and-a-half-year highs on Tuesday as investors waited on an announcement by President Donald Trump on whether the United States will reimpose sanctions on Iran.

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British within-day gas prices rose on Friday morning as lower gas imports created an undersupplied system, but warmer temperature forecasts over the weekend weighed on day-ahead.

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Oil prices were little changed on Friday after rising earlier, as market jitters kicked in over the prospect of geopolitical risks from possible new U.S. sanctions against Iran.

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British prompt gas prices rose on Wednesday as Norway diverted deliveries to mainland Europe at the same time as a pipeline shutdown cut flows into a domestic terminal and created supply shortfalls. ›

Oil prices rose on Wednesday, pushed up by concerns that the United States may reimpose sanctions on major exporter Iran, although soaring U.S. supplies capped gains. ›

Prompt British wholesale gas prices slipped on Tuesday as a brief cold snap retreated and Norwegian gas supplies along one pipeline offset an outage on another. ›

Oil prices held steady on Tuesday as the dollar remained near a four-month high, with crude supported by worries that U.S. President Donald Trump may pull out of the Iran nuclear deal. ›

Prompt British wholesale gas prices rose on Monday morning as cooler weather lifted demand and imports from Norway fell as gas was re-routed to the continent. ›

Oil prices dipped on Monday after a rising rig count in the United States pointed to higher production there, but markets held near their highest in over three years and remained set for a second straight month of gains. ›

Oil prices rose on Thursday, lifted by concerns over supply disruptions in Venezuela and the Middle East as well as by strong demand. ›