Internet users posted pictures of baton-wielding security personnel in Urumqi, a city of more than two million people and the scene of clashes in 2009 between mostly Muslim Uighurs and members of China's Han majority that were Xinjiang's worst violence of recent years.
Last week two incidents in the region left at least 35 people dead and officials have vowed to crack down on what they call "terrorists".
"Wearing helmets, officers patrolled the capital holding guns and shields," said the state-run Global Times newspaper, describing the "heaviest security measures since 2009" in Urumqi.
China commonly steps up patrols for the July 5 anniversary of the riots but the report said: "Last week's violence in the region has made authorities particularly watchful."
The date also comes in the run-up to the Islamic holy month of Ramadan.
Numerous police cars patrolled Urumqi's streets and helicopters flew overhead, a city resident surnamed Wang told AFP on Friday via an online chat service.
"I haven't heard or seen any conflicts occur, and all shops and businesses seem to be running as normal," he said.
"Harmonious Xinjiang," he added, an apparent dig at the pacific image of the region often depicted in state propaganda.
That theme was highlighted on Friday evening's main national TV news broadcast, which carried segments on Xinjiang including images of dancing people in ethnic dress.
Xinjiang's population is 46 percent Uighur with 39 percent Han, who largely dominate the economy and are a majority in Urumqi.
"Despite what the West thinks about China, Beijing has for decades channelled money, technology and talent into developing Xinjiang, while respecting the culture, language and religion of its ethnic minorities," the official Xinhua news agency said Friday in a commentary.
Dilxat Raxit, spokesman for the Munich-based World Uyghur Congress WUC), said in an e-mail: "China is launching a coercion policy against Uighurs to forbid them from assembling and mosques from holding prayer ceremonies for Uighurs that died in the 7.5 incident in 2009.
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