At least 30 people were killed in a 6.8-magnitude earthquake that struck southwest China’s Sichuan province on Monday, triggering landslides and rocking buildings in the provincial capital of Chengdu, whose 21 million people are already under quarantine due to COVID-19.

The quake struck a mountainous area in Luding County shortly after noon, the China Earthquake Network Center said.

Sichuan, located on the edge of the Tibetan Plateau where tectonic plates meet, is regularly hit by earthquakes. Two earthquakes in June killed at least four people.

The death toll rose to 30 as the search for those trapped continued Monday night, state media said.

Authorities had previously reported 7 deaths in Luding County and 14 others in neighboring Shimian County to the south. Three of the dead were workers. in the Hailuogou Scenic Area, a nature reserve with glaciers and forests.

Along with the deaths, authorities reported rocks and earth falling from mountainsides,

damaging homes and cutting power, state broadcaster CCTV said. A landslide in blocked a country road, leaving it covered in rocks, the Department of Emergency Management said.

Buildings in Chengdu, 200 kilometers (125 miles) from the epicenter, shook. Resident Jiang Danli said she hid under a desk in her 31st-floor apartment for five minutes. Many of her neighbors ran downstairs worried about aftershocks.

The death toll rose to 30 as the search for those trapped continued Monday night, state media said.

Authorities had previously reported 7 deaths in Luding County and 14 others in neighboring Shimian County to the south. Three of the dead were workers. in the Hailuogou Scenic Area, a nature reserve with glaciers and forests.

Along with the deaths, authorities reported rocks and earth falling from mountainsides, damaging homes and cutting power, state broadcaster CCTV said. A landslide in blocked a country road, leaving it covered in rocks, the Department of Emergency Management said.

Buildings in Chengdu, 200 kilometers (125 miles) from the epicenter, shook. Resident Jiang Danli said she hid under a desk in her 31st-floor apartment for five minutes. Many of her neighbors ran downstairs worried about aftershocks.

China’s deadliest earthquake in recent years was a 7.9 magnitude earthquake in 2008 that killed nearly 90,000 people in Sichuan. The quake devastated cities, schools, and rural communities outside of Chengdu, prompting years of effort to rebuild with stronger materials.