Hyderabad, Deb 6: ``The five-storied building which collapsed on Friday at Narayanguda here is an illegal construction and the builder went ahead with construction without prior approval from the Municipal authorities,’’ said Hyderabad District Collector Hyderbad Navin Mittal on Saturday.
Reviewing the rescue operations at the site where the five-storied building collapsed on Friday, the administrative official observed ``Stringent action will be taken against those responsible for the illegal construction of this building.``We were able to secure the details and addresses of 13 persons who were killed on Friday. Efforts are on to trace out the presence of more bodies under the debris,’’the Collector added.