Brent crude rose above $125 a barrel on Thursday, its highest level since the start of the war.
The benchmark was trading near $70 before fighting began in late February.
Prices are rising on fears of a wider conflict and a longer US naval blockade of Iranian ports.
The Strait of Hormuz, a key route for global oil shipments, remains largely closed.
Markets were hit again after planned US-Iran talks in Pakistan failed to take place.
US President Donald Trump has signalled the blockade could continue for months if needed.
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