While two people were washed away in nullahs and another in a drain, one got swept away during Ganesh idol immersion, he added. In another incident, a man named Rameshwar Tiwari was killed after the wall of a power sub-station fell on his house in Asalpha village in suburban Ghatkopar," police said. His 35-year-old wife and nine-year-old son sustained injuries in the incident that took place in the early hours, they added.