Robust commercial crude inventories in the United States added to the pressure in the face of a supply glut, they said. US benchmark West Texas Intermediate for August delivery as up 52 cents at USD 52.17 and Brent crude for August rose 57 cents to USD 57.62 a barrel in late-morning trade following recent sharp losses.

"Rising uncertainties from the Greek debt bailout and China's stock market turmoil put global demand at risk," said Sanjeev Gupta, who heads the Asia-Pacific Oil and Gas practice at professional services organisation EY.

Commodity prices fell sharply this week with crude prices suffering their largest sell-off in five months, slumping more than 8.0 percent. Chinese stocks have taken a severe beating after government measures failed to staunch the bloodletting that has wiped out around a third of China's main share market in under a month.

Shanghai stocks traded wildly this morning, as the government beefed up the measures to arrest the stock market slump in the world's top energy consumer.

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