The state fire department said late on Tuesday that more than 180 soldiers were already working in the stricken Petropolis region, which saw hundreds of deaths from heavy rainfall in 2011.
The Quito Security Department said at least 48 more people were injured, while eight houses collapsed and others were damaged when the hillside gave way late on Monday. The authorities also reported 12 missing people.
"Bridges have collapsed. Roads have collapsed. People have died... this is a catastrophe of enormous proportions," South Africa's President Cyril Ramaphosa said, addressing a local community after inspecting the damage from the floods.
The police said the house collapsed around 12.30 pm in the Chopal market area.
The report said heavy rains in the early hours of Thursday caused flash floods and then landslides in the northwestern part of Tehran, and caused damage to Imamzadeh Davood, a religious shrine in the city.
Flash floods and landslides are a common occurrence in the mountainous terrain of the Himalayan nation especially during the annual monsoon rains between June and September.
The Brahmaputra River, one of the largest rivers in the world which flows from Tibet to India and finally into Bangladesh, burst its banks in Assam, inundating more than 1,800 villages in 26 districts this month.
Houses and businesses were destroyed in the Saturday night deluge, which left the town of Las Tejerias covered with mud and debris, including felled trees, household items and mangled cars.
The landslide occurred in Selangor state, on the outskirts of the capital, Kuala Lumpur, at around 3 am (1900 GMT) and flattened a hillside on an organic farm that officials say was operating the camp illegally.