The landslide killed a residential area in the Gjerdam municipality, located about 30 kilometers (19 mi) north of the capital Elo. Police said more than 900 people were evacuated from the area.
Rescuers continued to search for children and adults who feared being trapped in mud and debris, police said.
“We are fairly certain that there are people in the affected area, but we do not know whether all 11 are or whether the number is small,” police spokesman Roger Pettersen said at a news conference.
“We are still looking for survivors,” he said.
Pictures of the site showed a large pit with destroyed buildings beneath it. Other buildings were hung on the sides of the pit, shown in TV footage. Broadcaster NRK reported that two more houses fell into the pit on Wednesday afternoon.
King Harald of Norway said that the landslide had left a deep impression on him.
The 83-year-old emperor said in a statement, “My thoughts are with all those who are affected, injured or have lost their homes and who now live in complete danger and uncertainty of the catastrophe.” Palace.
Helicopters hovered over the area as night fell, many times emergency responders were lowered to the rubble of crumbling houses.
Prime Minister Erna Solberg told reporters after visiting the site, “People may be stranded … but at the same time we can’t be sure because it’s a New Year holiday, which means people can go elsewhere.”
Local residents spoke of their experience.
“There were two massive tremors that lasted a long time and I assumed that the snow was clearing or something like that,” 68-year-old Oystein Geigerdrum told NRK.
“Then Shakti suddenly went out, and a neighbor came to the door and said we needed to evacuate, so I woke up my three grandchildren and told them to get ready quickly.”
New Jersey reported at a news conference that Earth’s mass has been moving in one of the largest soils in Norway’s history recently.