At least 27 people have died in three separate cases -- two in Mumbai, another in Pune -- of wall collapse after record rainfall left the maximum city and adjoining areas paralysed on Tuesday.
Eighteen people were killed and over 50 injured when a wall collapses in Mumbai's \northern suburb of Malad early Tuesday following heavy rains.
In Pune, six labourers were killed and three injured after a wall collapsed in Ambegaon area late Monday night. A wall collapse in Kalyan in Thane district early Tuesday killed three people, officials said.
Most roads were clogged and local train services, the lifeline of the financial capital, virtually came to a standstill.
Flight operations at Mumbai's Chhatrapati Shivaji International Airport were also hit severely due to heavy rains and a SpiceJet aircraft blocking a runway after overshooting it shortly before midnight.
The Maharashtra government declared a precautionary public holiday on Tuesday in Mumbai, with Chief Minister Devendra Fadnavis requesting people to stay indoors unless they have absolutely important work outside.
The BrihanMumbai Municipal Corporation (BMC) declared a holiday for all schools and colleges, and the state government expanded it to include other parts of coastal Konkan region.
Mumbai received 375 mm of rainfall on Monday, making it the maximum July downpour that the city has seen over a 24-hour period, breaking the record of 1974.
Altogether 54 flights were diverted and 52 cancelled at Mumbai's Chhatrapati Shivaji Maharaj International Airport due to inclement weather.
A SpiceJet flight from Jaipur skid and overshot the main runway while landing at the Mumbai airport amid heavy rains on Monday, although none of the passengers were hurt in the incident, an airline spokesperson said.
A wall collapsed on hutments in Pimpripada area of Malad East due to heavy rainfall. A senior NDRF official told reporters at the site that his team searched the debris with advanced equipment and also by canine search for bodies.
The official said that around 2 am, a compound wall in Pimpripada collapsed, trapping people living in shanties adjacent to the wall.
"Our team of National Disaster Response Force along with sniffer dog reached the site of the incident immediately after receiving the information. Besides, a team of fire brigade and local police also reached the spot and took control of the situation," a senior NDRF official said.
The injured were taken to Jogeshwari Trauma Hospital and Kandivali-based Shatabdi Hospital, a civic official said.
In the incident in Kalyan, the wall of an Urdu school behind Durgai Fort collapsed around 1 am, killing three people in the hutments adjacent.
Heavy rains also saw a joint evacuation operation in suburban Kurla with the NDRF, Navy and fire brigade shifting some 1,000 people to temporary shelters, a Navy official said.
A Navy team encountered extreme waterlogging and abandoned vehicles, preventing their own vehicles from reaching the site, the official added.
The team moved on foot, carrying safety gear like lifebuoys and lifejackets and was able to help elderly women and children to safer areas.
Authorities have declared Tuesday as a public holiday in Mumbai as the Indian Meteorological Department has forecast heavy rains.
"In the wake of the extreme heavy rainfall forecast by the IMD, the Government of Maharashtra has declared a public holiday on July 2 as a precautionary measure for Mumbai city and its citizens," a civic official said.
Students, who were supposed to come to Mumbai on Tuesday for their documents verification for the undergraduate admission in MBBS, BDS and BAMS courses, have now been given the date of July 5, for the same procedure, CET Commissioner Anand Rayate said.
The Mumbai University has also postponed the exam of B.Sc Computer Science for first and second year students due to heavy rains, an official said.
The Central Railway has also decided to run local trains in limited corridors due to water logging on the railway tracks.
"Trains will run in CSMT-Andheri-Goregaon section in harbour line. Vashi to Panvel in harbour line. Thane to Vashi and Panvel in trans harbour line. CSMT to Thane Karjat and Khopoli sections," a CR official said.
He said CR personnel, with the help of RPF jawans, rescued thousands of passengers stranded in midnight local trains and served them tea, biscuits and other edible items at stations.
A senior official of the Western Railway said its suburban services are running between Churchgate and Virar even if the frequency was less.
"Frequency may be less between Vasai Road and Virar due to receipt of outstation trains," he said.
Suburban local train service is also badly affected as low lying areas were submerged. The signalling system became dysfunctional, forcing railway administration to suspend local as well as long-distance train movement, said an official from Central Railways.
Over long-distance trains of the central and western railways were either cancelled or terminated ahead of final destination due to heavy rainfall, the official said.
Power utility companies have also suspended the supply in some suburban areas of Mumbai as a precautionary measure.
The heavy downpour also forced Maharashtra Chief Minister Devendra Fadnavis to cancel his scheduled groundbreaking function of the construction of a new building for MLAs.
The Meteorological Department has warned of "extremely heavy" rainfall in adjoining areas of Thane and Palghar on July 2, 4 and 5. A few places in Mumbai could get heavy to very heavy rainfall Monday and Tuesday, it added.
Private weather agency Skymet said Mumbai is at "serious risk of flooding" between July 3 and 5. "Close to 200 mm or more rain per day is likely during this period, which could hamper normal life," it said.
(With inputs from agencies)