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Parks Canada closed the Icefields Parkway on Wednesday, citing a high risk of an avalanche.

The scenic road, Highway 93 north through Jasper National Park, was closed between Athabasca Falls and the Saskatchewan River.

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The 120-km stretch was expected to re-open Thursday evening.

Avalanche technicians and road crews were working on the road, Parks Canada said in a release.

The closing comes after two American snowshoers were presumed to have died in an avalanche north of Lake Louise.

Mounties were contacted Tuesday by staff from a hotel that two guests from Boston hadn’t checked out of their room in Field, B.C., just west of the Alberta border.

Their rental vehicle was discovered a short time later at a trail head north of Lake Louise on Highway 93, an area that recently saw an avalanche.

Parks Canada said safety specialists found snowshoe tracks near the rental vehicle that led to avalanche debris. They found no tracks coming out.