Canada's Industry Department said on Friday it has extended the review of PetroChina's (601857.SS) $5.4 billion purchase of shale gas assets from Encana Corp (ECA.TO) by 30 days, saying such moves are not unusual. Industry Minister Tony Clement had been expected to go beyond the initial 45-day review period due to the campaign for the May 2 federal election. The review is to determine if the deal has a net benefit to Canada. "The minister will take the time necessary to do a thorough review of this investment proposal," the department said in a statement. (Reporting by Jeffrey Jones and David Ljunggren; editing by Rob Wilson)
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