Building collapses are frequent in India, and illegal structures -- often home to migrant workers -- are common in big cities.

At least 11 people, including three children, were killed in New Delhi after a residential building collapsed on the outskirts of the Indian capital, local reports and authorities said.

"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 ...