Shahid Iqbal Choudhary, a civil administrator, said the security curfew was imposed in the region’s main city of Srinagar in view of information about protests planned by anti-India groups to mark August 5 as Black Day.
Police and paramilitary soldiers drove through neighbourhoods and went to people’s homes, warning them to stay indoors.
Government forces, carrying assault rifles and in riot gear, erected steel barricades and laid razor wire across roads, bridges and intersections.
They patrolled largely deserted streets in Srinagar and enforced restrictions on civilian movement.
The curfew will be enforced Tuesday and Wednesday, Mr Choudhary said in a government order.
Scores of young men were detained in the last few days in anticipation that they would organise anti-India protests in the region, a police officer said on condition of anonymity in keeping with department policy.
“A series of inputs have been received suggesting that separatist and Pakistan-sponsored groups are planning to observe August 5 as Black Day and violent action or protests are not ruled out,” he said.
Last year on August 5, India’s Hindu-nationalist government led by prime minister Narendra Modi downgraded Jammu-Kashmir state and divided it into two federally governed territories.
Since then, New Delhi has brought in new laws that locals say are aimed at shifting the demographics in the Muslim-majority region, many of whom want independence from India or unification with Pakistan.
The status of Kashmir has been a key dispute between Pakistan and India since the two split after the end of British colonial rule.
They each control part of Kashmir and have fought two wars over their rival claims.
Initially, the anti-India movement in the Indian-controlled portion of Kashmir was largely peaceful, but after a series of political blunders, broken promises and a crackdown on dissent, Kashmiris launched a full-blown armed revolt in 1989.
After the August 5 move, Indian authorities enforced an information blackout and a harsh security clampdown in Kashmir for months.
Thousands of Kashmiri youth, pro-freedom leaders and politicians who have traditionally supported Indian rule were arrested. Hundreds of them are still incarcerated.
As some of the restrictions were eased, India enforced another harsh lockdown in March to combat the spread of the coronavirus, deepening the social and economic crises in the restive region.
Human Rights Watch asked that India reverse its “abusive policies” in the region and said it was dismayed that India persisted with “its repression of Kashmiri Muslims” despite the pandemic forcing the world to address discrimination and inequality.
“Indian government claims that it was determined to improve Kashmiri lives ring hollow one year after the revocation of Jammu and Kashmir’s constitutional status,” Meenakshi Ganguly, the global rights group’s South Asia director, said in a statement.
“The authorities instead have maintained curfew on Kashmiris in violation of their basic rights.”
Meanwhile, the president of Pakistani-controlled Kashmir urged the international community to save Kashmiri people from what he described as “imperialism” and said Kashmiris were being made homeless in their own homeland.
Sardar Masood Khan commented in a video message, a day after Pakistani foreign minister Shah Mahmood Qureshi and Defense Minister Pervez Khattak visited a frontier village along the Line of Control that divides Kashmir between India and Pakistan.
Indian and Pakistani soldiers have traded near-daily gunfire along the highly militarised line for over a year, killing dozens of civilians and soldiers on both sides.
Each has accused the other of violating their 2003 ceasefire accord.
The rival troops again attacked each other’s positions along the de facto frontier early on Tuesday and blamed each other for initiating the skirmishes.
Pakistani officials said at least 11 people were wounded in the Indian firing in Tattapani village.
The Indian military said its soldiers responded to the Pakistani shelling and reported no casualties.