At least two people were killed and several more were trapped after an incomplete five-story building collapsed in India's technology hub of Bengaluru on Wednesday, officials said.

The residential building, which had been under construction for several months, was located in the city's Bellandur neighbourhood, home to upscale apartment blocks, hostels and offices of technology companies.

The area, which surrounds a lake of the same name and flanks a major ring road, has experienced a construction boom in recent years.