In a sign of investor concern that the world's biggest economy could be heading for recession, the US Treasury bond yield curve inverted on Wednesday for the first time since 2007.
Also helping sentiment were comments from U.S. President Donald Trump that negotiations with China on trade were "productive", suggesting a possible easing of trade frictions that have roiled markets.
A trade war between to the world's two largest economies has roiled global markets and fuelled worries about a slowdown in oil demand growth.
Iran sold its heavy crude oil at $62.65 per barrels in the mentioned month, registering a 2.9 percent raise compared to June's $60.88 per barrel. The global benchmark was 2.4% lower, at $58.05/Bbl, and West Texas Intermediate crude was down 1.4%, to $54.47/Bbl.
"The rebound has a corrective look about it on thin volumes, rather than a beachhead for an impending rebound", Jeffrey Halley, senior market analyst at OANDA, said.
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The US claims the tanker is controlled by Iran's Revolutionary Guard, which is the target of its sanctions. Analysts had said the release of the Grace 1 by Gibraltar could see Britain's Stena Impero go free.
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US President Donald Trump has made no secret of his desire for a US pullout from Afghanistan and an end to America's longest war. Afghanistan's government has been sidelined in those talks as the Taliban refuse to negotiate with what it calls a US puppet.
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One of Ms Dunn's friends, Joan A Westenberg, described the 24-year-old on Twitter as a "true delight" and "incredible". Investigators are still trying to piece together why Ney - who had a history of mental illness - launched the attack.
"While the outlook for market fundamentals seems somewhat bearish for the rest of the year, given softening economic growth, ongoing global trade issues and slowing oil demand growth, it remains critical to closely monitor the supply/demand balance and assist market stability in the months ahead".
At 440.5 million barrels, USA crude oil inventories were about 3 percent above the five-year average for this time of year.
That increases pressure on Saudi Arabia, the cartel's de facto leader, which has shouldered most of the burden in production cuts aimed at bolstering oil prices amid faltering demand and a relentless flood of new shale supplies from the U.S. OPEC's efforts have been undermined by worries about a slowing global economy amid a trade dispute between the United States and China, as well as rising USA stockpiles of crude and higher output of US shale oil. He said the rebound could be short-lived: "As darker clouds gather on the economic horizon, the ensuing pessimism is likely to limit financial players' appetite for risky assets, including oil". A slump in exports sent Germany's economy into reverse in the second quarter.
The policy has been giving a sustained boost to USA shale and other rival supply, and the report suggests the world will need significantly less OPEC crude next year. United States crude stocks grew by 1.6 million barrels last week, compared with expectations for a drop of 2.8 million barrels, the Energy Information Administration (EIA) said.