The debris of the collapsed building in East Delhi is yet to be cleared even as rescue workers continue to search for any trapped survivors this morning. A senior fire brigade official said, the debris clearance operation at the collapsed spot in Lalita Park is on and it may take some more hours to clear it. The toll in the four-storey building collapse rose to 67 with the death of an injured late Tuesday night.The entire structure came crashing down around 8.15 PM on Monday. Over 60 families, mostly labourers from West Bengal, were living in the cramped quarters of the 15-year-old building, where an illegal fifth floor was under construction.Director of Delhi Fire Services, R C Sharma said the rescue workers would have to remove every bit of debris and ensure nobody is trapped in the basement.Following the incident, the Delhi government has ordered for a magisterial inquiry into the incident. It also directed MCD to urgently make a survey of all buildings in Laxmi Nagar area to determine their structural deficiencies, if any.Urban Development Minister A K Walia said authorities are looking into how the building was allowed to come up and prima facie it seems that proximity to the river Yamuna and water-logging were the reasons behind the collapse.