An FIR was also lodged against jail superintendent, Kripa Shankar Pandey, Inspector General of Jail Anand Kishore said.
Chief Minister Nitish Kumar, who returned to Patna from New Delhi, this afternoon took a strong note of the incident which was captured on camera and went viral on social media, and ordered immediate "stern action".
A report from Kisanganj said the jail superintendent had been captured on the camera indulging in "indecent activity" with the minor girl of a foodgrain shopkeeper, who had been supplying food items in the Kisanganj jail for the past many years.
The SDPO while talking to reporters last night said prime facie the allegation was true.
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Asked about the incident, the jail superintendent last night claimed to have told reporters that he had "fatherly relation with the girl".
When questioned about the photographs, the Jail Superintendent said "if photographs are indecent what can I do. You derive any meaning you want."
Some months back, a complaint of indulging in "unnatural sex" with the inmates on trial was levelled against Pandey, who was the jailor in the Kisanganj prison at that time.
The official was later promoted as superintendent in the same Kisanganj jail.