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A major rock slide that injured two construction workers earlier this week has closed the Trans-Canada Highway in Yoho National Park until at least Thursday evening.

Late Monday, contractors were drilling holes to place explosives at the rock-scaling site, 16 kilometres west of Field, B.C., when the rock and debris came crashing down.

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“Two contractors working on site were … transported to hospital with non-life-threatening injuries,” said Parks Canada spokeswoman Lindsay McPherson in an email. “Parks Canada’s thoughts are with the individuals and we wish them a speedy recovery.”

The highway has been closed in both directions since the incident.

It now isn’t expected to reopen until later on Thursday, according to DriveBC. The website will be updated again on Thursday around noon.

Officials with Parks Canada said approximately 10,000 cubic metres of rock and debris fell in the slide, requiring a geotechnical assessment.