The jail superintendent, Kripa Shankar Pandey, was suspended and an FIR was lodged against him, Inspector General of Jail Anand Kishore confirmed to PTI.
Pandey was later arrested and taken to the Sadar police station, its station house officer Ahtab Ahmed said.
After returning to Patna from New Delhi, Chief Minister Nitish Kumar this afternoon took strong note of the 'indecent activity' which was captured on camera and went viral on social media, and ordered immediate "stern action".
Superintendent of Police Rajiv Ranjan had yesterday asked Sub Divisional Police Officer Kamini Wala to probe the matter.
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The SDPO, while talking to reporters last night, had said prime facie the allegation was true.
Asked about the incident, the jail superintendent last night claimed he had "fatherly relation with the girl".
When questioned about the photographs, he said "If photographs are indecent what can I do. You derive any meaning you want."
Then district magistrate of Kisanganj Animesh Kumar Parasar had sent a report to the jail authorities at that time.
The official was later promoted as superintendent in the same Kisanganj jail.