One of the worst earthquakes in decades struck central China on Monday, killing nearly 9,000 people, trapping about 900 students under the rubble of their school and causing a toxic chemical leak, state media reported.

The 7.8-magnitude earthquake devastated a hilly region of small cities and towns in Sichuan and nearby provinces. The official Xinhua News Agency said 8,533 people died in Sichuan alone and dozens of other deaths were reported in surrounding areas.

Xinhua said 80 per cent of the buildings had collapsed in Sichuan province’s Beichuan county after the quake, raising fears the overall death toll could increase sharply.

State media said a chemical plant in Shifang city had cratered, burying hundreds of people and spilling more than 80 tons of toxic liquid ammonia from the site.

The earthquake sent thousands of people rushing out of buildings and into the streets hundreds of miles away in Beijing and Shanghai. The temblor was felt as far away as Vietnam and Thailand.

It posed a challenge to a government already grappling with discontent over high inflation and a widespread uprising among Tibetans in western China while trying to prepare for the Beijing Olympics this August.

The quake hit about 60 miles northwest of Chengdu — a city of 3.75 million — in the middle of the afternoon when classrooms and office towers were full. There were several smaller aftershocks, the US Geological Survey said on its Web site.

Xinhua said 50 bodies had been pulled from the debris of the school building in Juyuan town but did not say if the children were alive. Students also were buried under five other toppled schools in Deyang city, Xinhua reported.

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