The accident late Monday in the western town of Mahad led three disaster-response teams and sniffer dogs to work through the night, combing tin sheets, twisted metal and broken bricks.

Officials said many residents of the 47 flats inside the building were spared because they had already fled the town to escape the coronavirus pandemic.

The cause of the accident was not immediately clear but building collapses are common during India's June-September monsoon, with old and rickety structures buckling after days of non-stop rain.

National Disaster Response Force spokesman Sachidanand Gawde told reporters that locals and emergency workers had retrieved the bodies of 11 victims in addition to the little boy who survived the collapse.

Video of the rescue effort showed onlookers applauding and cheering as the child was plucked out of the wreckage and hauled up on a stretcher.

Estimates of the number trapped ranged from 20 to 70 on Tuesday morning after dozens managed to flee when the building began to shake.

"No one knows how many people are actually stuck inside," a Mahad police official told AFP on condition of anonymity, adding that authorities had initially feared much worse, with early estimates as high as 200.

Mahad legislator Bharat Gogawale told AFP that many of the building's occupants appeared to have been out shopping when the accident occurred around 7:00 pm.

Others had left the town altogether, preferring to wait out the pandemic in their home villages.

"Many families were not residing in the building as they went to their native places due to the coronavirus-induced lockdown," district official Nidhi Choudhari told the Press Trust of India.

Residents' complaints

As emergency workers made their way through the wreckage, looking for survivors, distressed relatives watched, desperate for news of their loved ones.

"Three people from my family are stuck under the rubble -- my mother, my sister and my nephew," said Gazala, a doctor who preferred to give only her first name to AFP.

Mustafa Chafekar, a resident who had been in home quarantine after testing positive for the virus, told the Mumbai Mirror that he and his family of five initially thought they were experiencing an earthquake.

"We ran down immediately... The whole [structure] collapsed right in front of us," the 39-year-old said of their escape.

He said residents had previously complained to the builders about the condition of the complex.

Local politician Manik Motiram Jagtap told TV9 Marathi that the structure was 10 years old and built on "weak" foundations.

"It fell like a house of cards," Jagtap said.

Prime Minister Narendra Modi tweeted that he was "saddened".

"My thoughts are with the families of those who lost their dear ones. I pray the injured recover soon," he said.

The monsoon plays a vital role in boosting agricultural harvests across South Asia. But it also causes widespread death and destruction, unleashing floods, triggering building collapses and inundating low-lying villages.

The death toll from monsoon-related disasters this year has topped 1,200, including more than 800 in India.

The building collapse is a further blow to the state of Maharashtra, already hit hard by the coronavirus, with the region accounting for more than a fifth of India's more than three million infections.

The pandemic has also cast a shadow over India's ongoing Ganesha Chaturthi festival, with Hindu devotees ordered to sharply scale down celebrations and rituals honoring the much loved elephant god.

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