RCMP say an avalanche has triggered a large landslide, which has blocked Highway 16 near Mount Robson, on the Alberta-BC boundary.
Const. Lesley Smith says it's unknown if any vehicles were caught up in the 400-metre-wide slide that came down over the route at about 9:30 this morning.
She says the ministry is warning that the risk of additional slides is very high and that it's too dangerous to enter the area to look for any vehicles.
Smith says no detours are available and that an avalanche technician is en route as the Transportation Ministry assesses the slide.
Flagger crews are being placed at both ends of the slide, and in Tete Jaune, McBride, Valemount and Jasper, Alta.
Highway 1 is also closed indefinitely due to the avalanche danger.
For open routes to Alberta click here.
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