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BEIJING, April 4 (Xinhua) -- China's agricultural authorities said Thursday the infectious H7N9 avian flu virus has been detected from pigeon samples collected at a marketplace in Shanghai, as the country reported its fourth death from H7N9 infection.

Authorities in Shanghai have placed 194 people who had close contact with the 10 infected people under medical observation. Two have exhibited symptoms, although bird flu has been ruled out as the cause of their illness.

Li started commanding the quake rescue and relief work when he was in the flight cabin from Beijing, and urged that no minute or even second should be delayed during the "golden rescue period" in the first 72 hours after the quake.

He said the FTA fully demonstrates that China will not stall in its opening-up and that it is firmly committed to upholding the multilateral trading regime, vigorously promoting regional trade liberalization, and accelerating the implementation of the FTA strategy.

In Beijing, where there is no H7N9 case reported so far, the authorities have banned all live poultry trade outside the market and unlicensed butchering of poultry.