The Matia detention centre will also have a school, hospital and separate living quarters for men and women.

On 2 September, however, the Home Ministry said that those left out of the final National Register of Citizens (NRC) list in Assam will not be detained, under any circumstances, till they "exhaust" all remedies available under law.

Such people can appeal to the Foreign Tribunals within 120 days, it said, stressing that they will continue to enjoy all their rights as earlier, like any other citizens.

Assam's newest detention centre is likely to be ready by December 2019.