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Blocked streams, earthquake-loosened soil, mudslides and the upcoming rainy season create the risk of secondary disasters that can make relief work and rebuilding even more difficult, officials with the Ministry of Land and Resources said Thursday.

Avoiding further geological disasters during relief work and rebuilding will be a “daunting task,” said Yun Xiaosu, vice minister of land and resources.

The earthquake and aftershocks created 34 lakes, known as barrier lakes, as debris blocked rivers and streams throughout the earthquake area.

“The dangers at the barrier lakes are severe,” Yun said. “The water level in some lakes is high and rising. If there’s a break, it will cause severe damage.”

People who might be in the way of breaks already have been evacuated, he added.

The region’s rainy season starts in June, creating further problems and risk of major mudslides, Yun said.

The torch relay, a symbol of the country’s hopes for the Beijing Olympics, restarted Thursday with a minute of silence at a container terminal in the eastern seaport city of Ningbo. The torch run has been toned down in the wake of the quake.

Originally planned for next month, organizers said the Sichuan leg of the run would be delayed until just before the start of the Aug. 8 games.

In another sign of attempts to return to normal after the quake, officials in the Sichuan provincial capital of Chengdu ordered all government bodies and companies to resume regular operations, Xinhua reported.

Associated Press writer Elaine Kurtenbach in Ningbo contributed to this report.