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.
"We have estimated between 15 and 20 people who are still missing," Defence Minister Jose Gavidia said on a visit to the town on Tuesday night, some 12 hours after the collapse of the hill.
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.
At least 22 people were killed when a landslide triggered by monsoon rains struck a village in eastern Myanmar, as emergency workers continued the search on Saturday
Every year monsoon rains hammer Myanmar and other countries across Southeast Asia, submerging homes, displacing thousands and triggering landslides.
Typhoon Lekima made landfall early on Saturday in the eastern province of Zhejiang with winds gusting to 187 km (116 miles) per hour, causing travel chaos with thousands of flights cancelled and rail operations suspended.
Search and rescue teams were at the scene in Al-Arid in the northern governorate of Al Dhahirah, Oman's Civil Defence and Ambulance Authority said.
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.