A around 50-year-old five-storey building housing a boys' hostel collapsed in a congested bylane in Satya Niketan near Delhi University's South Campus on Sunday afternoon, leaving two students dead and many trapped, officials said.

Eight people have been pulled out of the debris so far, of whom one was brought dead to the hospital, another died during treatment. Five are critical, and one rescuer who received injuries was discharged, police said.