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People take part in an evacuation drill in Jiangyou, Sichuan province May 27, 2008. [Xinhua]
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Cai Qihua, of the Yangtze River Water Resources Commission, said 26 excavators and bulldozers were being used around the clock.
The water is rising by nearly 2 m a day and reached only 23 m below the lowest part of the barrier Tuesday, she said.
Many towns and villages downstream held evacuation drills Tuesday.
In Tianlin village, among the first to be flooded if the lake bursts, gongs and loudspeakers directed 680 villagers to rush to surrounding hills within 20 minutes.
"The flood will sweep our village in 5 or 6 hours if the dam collapses," the village head said.
Diggers, including PLA soldiers and armed police, use excavators and bulldozers to dig a diversion channel for a quake lake at Tangjiashan, Beichuan County, which was formed by landslides after the May 12 earthquake and now blocks the river Jianhe on May 26, 2008. Helicopters have airlifted professionals and materials for the operation to the area Monday afternoon. [Xinhua]
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Jianjiang River runs into Fujiang River about 10 km north of the village.
Compounding flood fears, two fresh aftershocks struck quake-hit areas Tuesday.
A 5.7-magnitude aftershock struck Ningqiang county of Shaanxi province Tuesday at 4:37 pm. It was also felt in the provincial capital of Xi'an.
Earlier, at 4:03 pm, a 5.4-magnitude aftershock hit Qingchuan county in Sichuan, which is very close to Ningqiang,
The two aftershocks were also felt in the Sichuan provincial capital Chengdu and parts of Chongqing and Gansu.
More than 60 people were injured and 420,000 houses in Qingchuan collapsed in the aftershocks.
Qingchuan was the epicenter of a 6.4-magnitude aftershock on Sunday afternoon, which was the strongest aftershock since May 12.
The death toll from the quake reached 67,183 by midday Tuesday, with 361,822 injured and 20,790 missing, according to the Information Office of the State Council.
More than 45.61 million people were affected in the deadly quake, and about 15 million have been displaced, according to the office.
By noon Tuesday, donations in cash and relief materials from home and abroad reached 32.7 billion yuan ($4.7 billion). So far, 9.4 billion yuan ($1.35 billion) has been forwarded to the quake-affected areas, the office said.
Meanwhile, 566,400 tents had been sent to quake-affected areas by noon Tuesday, according to the Ministry of Civil Affairs.