SRINAGAR, IndiaSRINAGAR, India (Reuters) - Authorities in Indian Kashmir tightened restrictions on people's movements on Saturday to prevent possible protests following a speech by Pakistani Prime Minister Imran Khan.

In an address to the United Nations General Assembly on Friday, Khan warned of a bloodbath once India lifts its restrictions in Kashmir, which have been in force since it revoked the region's decades-old autonomy in August and detained thousands of people.

Soon after the speech, hundreds of Kashmiris came out of their homes, shouting slogans in support of Khan late on Friday night and calling for the independence of Kashmir.

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Muslim-majority Kashmir has long been a flashpoint between nuclear-armed India and Pakistan, which have fought two of their three wars over the divided territory. Both countries rule parts of Kashmir while claiming it in full.

On Saturday, police vans fitted with speakers made public announcements in some parts of Srinagar about movement restrictions, while additional troops were deployed to prevent protests, according to officials and two witnesses.

The troops also blocked access to the main business center of Srinagar with razor wire.

"This was necessitated after protests across Srinagar city last night soon after Imran Khan's speech," said a police official, who declined to be identified.

Two Indian officials said six militants and one Indian soldier had been killed in two separate incidents in the state, two officials said.

Three militants were killed in Ganderbal, about 12 miles (19 km) north of Srinagar, according to one of the officials, who declined to be named. Another three were killed in Batote, located on the highway connecting Jammu and Srinagar, Indian defense spokesman Lieutenant Colonel Devender Anand said.

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"INHUMAN CURFEW"

India's crackdown as it revoked Kashmir's special status was accompanied by severe restrictions on movement, as well as disconnection of telephone services. Though New Delhi has eased some of the movement curbs, no prominent detainees have been freed and mobile and internet connections remain suspended.

While warning of the consequences of lifting what he described as an "inhuman curfew," Pakistani premier Khan demanded India do so and free all detainees.

In some areas in Kashmir -- including the Soura region near Srinagar which has witnessed protests in the past against India's decision -- people clashed with security forces by pelting stones on Friday night, forcing police to use tear gas to disperse them, said the Indian official.

Khan addressed the United Nations a day after the senior U.S. diplomat for South Asia called for a lowering of rhetoric between India and Pakistan, while saying that Washington hoped to see rapid action by India to lift restrictions it has imposed in Kashmir and the release of detainees there.