New Delhi: Minister of State for Home Affairs, Nityanand Rai, on Wednesday said that the Aadhaar number under the National Population Register (NPR) is collected voluntarily.

On plans to link NPR data with the data stored in the Aadhaar database, Rai, in a written reply in the Lok Sabha, said, "In pursuance of Sub-rule (4) of Rule 3 of the Citizenship (Registration of Citizens and Issue of...