BEIJING (Reuters) - China is on precautionary alert against possible radiation leaks from the deadliest earthquake to hit the country in three decades, according to government website seen on Friday.
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The disaster area is home to China's chief nuclear weapons research lab in Mianyang, as well as several secretive atomic sites, but no nuclear power stations.

Minister of Environmental Protection Zhou Shengxian convened an emergency meeting late on Monday, hours after the 7.9 magnitude tremor rocked the southwestern province of Sichuan, and activated the lowest tier of a four-stage system of ranking radiation leaks, the ministry said on its website (www.zhb.gov.cn).

President Hu Jintao flew to Mianyang on Friday, four days after the quake, which is thought to have killed more than 50,000 people, state television and the official Xinhua news agency reported, in an indication the …