Earlier in the day, the Allahabad High Court had directed the CBI to arrest Sengar.
Sengar was detained by the CBI during early morning hours. The development came after the Centre gave a nod for a CBI probe into the matter on Thursday.
The counsel for the Uttar Pradesh government had told the High Court that Sengar has been detained for interrogation, after which a bench comprising Chief Justice DB Bhosale and Justice Suneet Kumar asked the CBI to arrest Sengar.
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The court asked the probe agency to carry out investigation strictly in accordance with the law and to file a status report by May 2.
The Allahabad High Court on Thursday rebuked the UP government for being tardy in arresting BJP MLA Kuldeep Singh Sengar, despite an FIR against him.
The Banagrmau MLA is facing questions by CBI in cases related to the alleged rape of the minor girl and the death of her father in police custody. The CBI has registered three separate cases against BJP MLA Kuldeep Singh Sengar and his brother, for allegedly raping a minor girl.
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The Uttar Pradesh government had referred the matter to the CBI which registered the case after getting the reference from the centre.
An FIR was lodged against the BJP MLA Kuldeep Singh Sengar on Thursday under sections 363 (kidnapping), 366 (abduction of woman), 376 (rape), 506 (criminal intimidation) of the Indian Penal Code (IPC) and Protection of Children from Sexual Offences (POCSO) Act, and the case was handed over to the CBI.