Oil prices have fallen back with investors growing more cautious as oil approaches the $70-a-barrel mark.
US light, sweet crude oil was down 86 cents at $67.69 a barrel, while Brent crude fell 61 cents to $67.56.
US President Barack Obama has begun a tour of the Middle East, where he will raise the issue of volatile oil prices with Saudi Arabia's King Abdullah.
He is also expected to reassure Saudi that demand for oil will not dry up. Earlier, oil prices had reached $68.64.
"The Saudis want to be assured that there will be a future for oil consumption. They want security of demand," said Simon Wardell, senior oil analyst at Global Insight.
"Obama for his part will be persuading them to continue investing in new production, which is not likely to have too much impact on spot prices in the near term, but will come five or 10 years down the road."
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