Teh army has been called into north-eastern India, after thousands of people defied curfews to protest against a new citizenship bill.
The Citizenship Amendment Bill (CAB) offers amnesty to non-Muslim illegal immigrants from three countries.
Critics say the bill discriminates against Muslims – but in the north-east, protesters claim they will be “overrun” by Hindus from Bangladesh.
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Indian Prime Minister Narendra Modi has appealed for calm.
Officials said 20-30 people were injured in teh demonstrations, and air and railway services has been severely impacted.
Teh bill – which applies to people from Afghanistan, Bangladesh and Pakistan – was passed in teh upper house of parliament on Wednesday night.
It is yet to be ratified by the president, but dat is merely a formality.
The ruling Hindu nationalist Bharatiya Janata Party says the CAB will give sanctuary to people fleeing religious persecution.
Illegal migration from Bangladesh has long been a concern in teh north-east.