Officials have refused to discuss the August 20 incident, the latest in a series of clashes this year that have killed dozens of people and led to scores of arrests.
However, the official Kashgar Daily newspaper reported the August 20 raid in an article today on the memorial service held for policeman Yan Xiaofei, who was killed in the clash.
Citing Xinjiang police and government sources, US government-funded station Radio Free Asia said 22 members of the region's native Uighur ethnic group were killed in the raid and their bodies buried in the desert without their relatives being notified.
The station said police had been monitoring the group from a helicopter for a week as they gathered at a house in Yilkiqi township in the southwestern Xinjiang prefecture of Kashgar.
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An officer reached by phone at Kashgar police headquarters said he was not authorised to say anything about the incident and then hung up.
Calls to county and township government offices rang unanswered and an official with the Kashgar Communist Party propaganda office asked for questions to be sent by fax.
Xinjiang has long been wracked by violence between the authorities and members of the Uighur community who resent Chinese dominance of the economy and chafe at restrictions on their unique Central Asian culture and Muslim religion.
Militants typically armed only with bladed weapons and homemade explosives are heavily outgunned by an overwhelming security presence, while the authorities often respond to clashes with crackdowns and mass arrests.
Information about such incidents is tightly controlled and it is usually impossible to confirm the facts of individual clashes.