NEW DELHI — The heaviest monsoon rains in a decade have struck Mumbai and nearby areas, killing 32 since Monday and disrupting life in the financial capital of India.

After nearly 16 inches of rain fell last night in some areas, several parts of the city became inundated in waist deep water. Local train and bus services have been disrupted. Schools and colleges were closed, and nearly 50 flights were canceled from Mumbai airport, where a SpiceJet plane overshot the runway.

The rains led to the collapse of three walls, which caused most of the deaths. A municipal wall in a Mumbai slum killed 21 when it fell. Six died after another wall collapsed in Pune, and three died after one fell in Thane, a suburb of Mumbai.