The secretary of the Lhasa committee of the Communist Party of China told China's official Xinhua news agency the city is a top priority in terms of maintaining stability in Tibet.
The city is often targeted for sabotage and infiltration by overseas separatists.
City officials have been ordered to tighten management of Lhasa's migrant population and require all people entering Tibet to carry identification beginning March 1.
Tibet was incorporated into the People's Republic of China in 1951 following a military conflict.
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