Minor boy Nirab (5) who has been found in an unconscious state from Buriganga River declared dead at Dhaka Medical College and Hospital.The doctors of Dhaka Medical College and Hospital declared him dead after taking to the hospital.Director General of Fire Service and Civil Defence Brig Gen Ali Ahmed Khan said, the body was discovered at around 8:25pm from Buriganga River and taken to the hospital.Earlier, Nirob has fallen into an uncovered manhole in the capital`s Shyampur area on Tuesday around 4 pm.