Rahul Gandhi is pointing to the existence of a detention centre in Matia, Assam, to accuse Prime Minister Narendra Modi of lying about the construction of such buildings.
People who visited the Matia detention centre, located in Goalpora district, found that nearly two-thirds of the construction had been completed.
This weekend, PM Modi said there had been no talks on a pan-India NRC -- a citizenship verification drive that has so far been implemented only in Assam -- and accused the Congress and others of spreading the rumour that Muslims would be sent to detention centres.
"The RSS's prime minister is lying to Bharat Mata," Rahul Gandhi said in a tweet on Thursday.
The Matia detention centre is being built at a cost of over Rs 46 crore; it will have the capacity to hold 3,000 detainees. It will house 15 four-storey buildings: 13 for men and two for women.
In 2018, the Home Ministry had sanctioned an amount of Rs 46.41 crore to construct the compound, which is spread over 28,800 sq ft of land, and is located 129 km from Guwahati, Assam's largest city.