The body was recovered from the water tank yesterday night after she went missing since evening, Netra Pal Singh, SHO, Railway Colony police station said.
The body was recovered with footwear and no injury mark was found on it with the police suspecting that the girl might have fallen into the tank while playing, he said.
However, the guard of the under-construction building was detained today for interrogation after the parents alleged that he might have murdered their daughter as he guided them towards the tank while they were searching for the missing girl, Singh said.