China's top police official has devised a secret list of 10 threats to Communist Party rule, naming the United States and the Soviet Union as enemies and warning that dissidents may stir up unrest among students, Chinese sources said Tuesday.

The list of "threatening social forces," seen as jeopardizing the party's leadership role, was revealed by Minister of Public Security Wang Fang in an unpublicized report to the powerful Politburo last month, said a source close to China's security apparatus.Wang identified the United States, Japan and the Soviet Union under the classification of "enemy country powers" of which China should beware, said the source, speaking on the condition of anonymity. Other sources confirmed the report's existence.

The internal report was intended for reference for China's leaders and was unlikely to have any impact on Beijing's foreign policy, the source said.

A spokeswoman for the Ministry of Public Security denied the existence of the report.