Oil prices have risen as markets grow anxious over the lack of details about the US-Iran deal and the prospect that restoring fuel flows through the Strait of Hormuz could take longer than expected.
Brent crude futures gained 26 cents, or 0.3 percent, to hit $83.42 a barrel, while US West Texas Intermediate (WTI) rose by 46 cents, or 0.3 percent, to reach $81.12 a barrel.
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