A mudslide in Jasper National Park early Tuesday morning forced the closure of Maligne Lake Road at the north end of Medicine Lake.

Steve Blake, the visitor safety manager for the park, said the slide likely happened between 3:30 and 5 a.m. when a localized thunderstorm hit the Maligne Valley.

"As a result we had several sections of the mountain slip on the road, leaving between 10 and 15 metres deep of rock and mud debris," Blake said.

Boats were brought in to take people out. There were only 14 people in the area at the time, Blake said.

The road is expected to remain closed for at least three days.

Blake said park officials should have a better idea of when it will re-open once a geotechnical specialist evaluates the area on Wednesday.