A powerful earthquake toppled buildings, schools and chemical plants Monday in central China, killing nearly 10,000 people and trapping untold numbers in mounds of concrete, steel and earth in the country’s worst quake in three decades.

The 7.9-magnitude quake devastated a region of small cities and towns set amid steep hills north of Sichuan’s provincial capital of Chengdu. Striking in midafternoon, it emptied office buildings across the country in Beijing and could be felt as far away as Vietnam.

Snippets from state media and photos posted on the Internet underscored the immense scale of the devastation. In the town of Juyuan, south of the epicenter, a three-story high school collapsed, burying as many as 900 students and killing at least 50, the official Xinhua news agency said. Photos showed people using cranes, mechanical hoists and their hands to remove slabs of concrete and steel.

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