CHENGDU, China - A powerful earthquake toppled buildings, schools and chemical plants Monday in central China, killing about 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 mid afternoon, it emptied office buildings across the country in Beijing and could be felt as far away as Vietnam.

As Tuesday dawned, rescuers were frantically searching for more survivors, but rain was compounding the difficulty. Premier Wen Jiabao, who flew to the region, said rain was forecast for the next several days.

The government was pouring in troops to aid in the disaster recovery. Xinhua said 16,000 were in the area and 34,000 more were en route.

Thousands of students buried

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.

The news agency reported on Tuesday that another 1,000 students and teachers were buried and feared dead when a high school collapsed in Beichuan county. The building was reduced to a pile of rubble two yards high, it said.

Buried teenagers struggled to break free from the rubble in Juyuan, "while others were crying out for help," Xinhua said. Families waited in the rain near the wreckage as rescuers wrote the names of the dead on a blackboard, Xinhua said.

Parents of the dead students built makeshift religious altars at the site, resting the corpses on any available piece of plywood or cardboard, and burning paper money and incense in a traditional honor for their child in the afterlife, according to NPR's Melissa Block.

Source: Associated Press (AP)