11 people killed after building collapse
The incident happened in the early hours in the northeastern district of the city that mostly houses migrant workers, with rescue teams digging through the rubble throughout the day.
Eleven people were pronounced dead, NDTV channel reported, though 11 others were rescued and taken to hospital. Five were still undergoing treatment, the network said.
Indian Prime Minister Narendra Modi said he was "saddened by the loss of lives".
"Condolences to those who have lost their loved ones," Modi's office posted on X. "May the injured recover soon."
President Droupadi Murmu, who lives in her official palace just 20 kilometres (12 miles) from the site, said that "the deaths of many people including women and children is very sad".
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Modi's ruling Bharatiya Janata Party recently won the Delhi state election for the first time in almost three decades.
The cause of the collapse was not immediately known.
Delhi minister Kapil Mishra blamed corruption in the municipal government, run by a rival political party, for such building collapses, saying on X: "Construction of such illegal buildings is going on in full swing."
"Survey of all these illegal buildings is necessary, strict action is required against them," he added.
Local media reports said that the four-storey building "came crashing down like a stack of cards".
Building collapses are frequent in India, and illegal structures -- often home to migrant workers -- are common in big cities.
