Oil prices have declined due to rising economic concerns in Europe and Asia, as well as a strong US dollar.
Brent crude oil futures edged down 51¢ to $50.03 per barrel, while the US crude fell 61¢ at $48.46 a barrel, Reuters reported.
A 1.2% rise in dollar will make fuel imports more expensive for countries using other currencies.
Commerzbank analyst Carsten Fritsch told the news agency: "A marked increase in risk aversion, as evidenced in falling stock markets and an appreciating US dollar, is responsible for the latest losses."
The rise in dollar was due to the prospect of a potential hike in US interest rates, and concerns over the Asian economy and that Great Britain will vote to leave the European Union later this month.
Worries about faltering growth in China also led to a decrease in oil prices.
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