The Obama administration's decision on the Keystone XL oil pipeline will not be made until at least June, a U.S. official said, which would delay the project for months and frustrate backers of Canada's oil sands.

"We're talking the beginning of summer at the earliest," said the source, who did not want to be identified due to the sensitive nature of the TransCanada Corp project, which has been pending for more than four and a half years. "It's not weeks until the final decision. It's months."

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