Building collapses: Who is responsible?

In the next 60 minutes, we will give you a tour of India's top cities to give you the best property options available in the country. We start with Gurgaon and Greater Noida, and then move to Hyderabad, Bengaluru, and finally to the city of Kolkata. And a special story on what is leading to rising incidents of building collapses in the Mumbai region. Four buildings have collapsed in the past three months claiming hundreds of lives but the government is yet to fix the root of the problem, here's a special report.