Three people died while one sustained injuries after a compound wall of the National Urdu School collapsed in Kalyan in the intervening night of Monday-Tuesday following heavy rainfall.
Whereas, at least six persons died, while three sustained injuries after a wall collapsed near Ambegaon police station on Tuesday night.
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Mumbai has been witnessing heavy downpour for the past few days.
In another incident, 13 people died after the compound wall of a building collapsed on hutments built on a hill slope in Kurar Village in the early hours of Tuesday due to heavy downpour.
According to the weather department, the city is predicted to see more heavy downpour showers throughout the week.