[11] In July 2008, an article published in Romerikes Blad stated that hydrologist and geologist Steinar Myrabø had warned the municipality of soil erosion and the potential risk of a landslide, calling for a halt in construction at Nystulia on behalf of Norwegian Society for the Conservation of Nature's local chapter.

According to the broadcaster NRK, intense rain in the days before the incident may have caused soil movements in the area.

[22] A video released by the police on 6 January shows a rescue helicopter over the landslide, searching for survivors.

[24] On 5 January the police stated that they no longer held out any hope of finding more survivors, but would continue the search for the last three victims.

The same day the Norwegian Armed Forces and their equipment left the area, with only the Home Guard left on the scene till 12 January[25][26][27] The Norwegian Civil Defence terminated their mission on 15 January and a civilian security company continued to guard the affected areas.

[31] Several government and private organizations, military units and volunteer organizations were involved in the search and recovery operation: The Nannestad and Gjerdrum Red Cross received large amounts of donations of toys, clothing, and hygiene products for the survivors of the landslide.

[39] The President of Finland Sauli Niinistö and the Prime Minister Sanna Marin also expressed their condolences to the Norwegian government and people.

[40] On 3 January 2021, King Harald V, Queen Sonja and Crown Prince Haakon visited the disaster area to speak with rescuers, volunteers, evacuees and their relatives.