Shortly before 1000 GMT, Brent North Sea crude for delivery in July jumped to $80.18 a barrel — the highest level since November 2014.
Around 1010 GMT, it pulled back to $79.79, still 51 cents higher than Wednesday.
Global oil supplies could be hit by President Donald Trump’s decision to pull the US out of the Iran nuclear deal, and also by falling production in crisis-hit Venezuela, the International Energy Agency said on Wednesday.
Prior to Thursday’s peak oil prices had already been rising thanks to steady demand growth and a landmark deal by oil producing countries, both inside and outside the OPEC cartel, to lower output. DM