Rescue workers search for survivors after a house collapsed amid heavy rainfall in Mumbai, India, on Sunday. Reuters

At least 30 people died in three Mumbai suburbs after several houses collapsed when heavy rain triggered landslides, officials said on Sunday, and forecasts of further downpours could force authorities to relocate people living in danger zones.

Rescuers were seen using bare hands to dig up the ground to retrieve bodies as torrential rain measuring between 150 mm to over 200 mm in some areas, submerged many areas and played havoc with road and rail traffic.

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At least 12 persons were killed when a wall collapsed after a tree fell at Vashi Naka in the Chembur area around 1am, according to the BMC Disaster Cell and NDRF.

Rescue workers search for survivors after a residential house collapsed due to landslides in Mumbai. Reuters

Local television news channels showed rescuers carrying the injured on makeshift stretchers using cloth inside narrow lanes.

However, the rain's repercussions were not felt much immediately since it was a Sunday, with most people remaining indoors, as the intensity dropped since daybreak.

In one of the neighbourhoods, about half a dozen huts located at the base of a hillock collapsed on top of each other, officials said.

Several areas in the city were waterlogged after heavy rainfall over the last 24 hours and suburban train services were disrupted, crippling India's financial capital, where incidents of building collapses have become more common during the monsoon.