Ticking time bomb: 22,000 Mumbai slums are landslide-prone In 2005, RTI activist Anil Galgali had sought information on how many slums lay close to landslide-prone locations and the government plans to relocate them. Share Via Email | A+A A- A resident looks on after a wall collapsed on several slum houses heavy monsoon rains in the Mahul area of Mumbai. (Photo | AP) Express News Service MUMBAI: A day after 35 people died in a wall collapse triggered by a landslide, Mumbai officials on Monday started evacuating people from vulnerable areas. However, with 22,000 slums housing over 1.50 lakh people in landslide-prone zones, activists fear such makeshift evacuations are only delaying a major disaster waiting to happen.