A team of plain-clothes security police wait outside the room where Premier Wen Jiabao is delivering his annual press conference.
The squad has been issued with small fire extinguishers, perhaps in response to the spate of self-immolations in protest at what some see as China's occupation of Tibet.
More than 20 Tibetan monks and nuns have set themselves on fire in last year, mainly in south-west China.
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