Critics say that the register has upended the lives of Muslims who have lived legally for decades.

(Web Desk) - The Indian government is building mass detention camps after almost two million people were told they could be effectively stripped of citizenship.

According to the Independent, around 1.9m people in the north-eastern state of Assam were excluded when India published the state’s final National Register of Citizens (NRC) list in August.

Those excluded from the register will have to appeal to prove they are citizens. The UN another international rights groups have expressed concern that many could be rendered stateless.

The Indian government claims that the migrants have arrived from neighbouring Muslim-majority Bangladesh.

Critics say that the register has upended the lives of Muslims who have lived legally in the state for decades.

Those appealing to be put on the register will need to provide documentation, such as birth certificates, dating back decades.

Record keeping in parts of rural India is poor and many, including those building the camps, have been caught out by the NRC’s stringent requirements.

“We don’t have birth certificates,” Malati Hajong, one of the labourers working at a site near the village of Goalpara, told the Reuters news agency.

The Goalpara camp is one of at least 10 planned detention centres, according to local media reports.

It is around the size of seven football pitches and designed to hold 3,000 people.

Officials plan to have a school and hospital at the centre, as well as a high boundary wall and watchtowers for the security forces.

Critics have accused the Modi administration of using the NRC to target Assam’s large Muslim community.

But the government says it is simply complying with an order from India’s Supreme Court, which said the NRC had been delayed for too long and set a strict deadline for its completion.

Government sources say those excluded from the list retain their rights and have 120 days to appeal at local “Foreigners Tribunals”. If that fails, they can take their cases to the High Court of Assam and ultimately the Supreme Court. What happens to those who fail at all levels of appeal is yet to be decided, they said.