YA’AN, China — Residents huddled outdoors Saturday night in a town near the epicenter of a powerful earthquake that struck the steep hills of China’s southwestern Sichuan province, leaving at least 156 people dead and more than 5,500 injured.

Saturday morning’s earthquake triggered landslides and disrupted phone and power connections in mountainous Lushan county five years after a devastating quake wreaked widespread damage across the region. The village of Longmen was hit particularly hard, with authorities saying nearly all the buildings there had been destroyed in a frightening minute-long shaking by the quake.

In nearby Ya’an town, where aftershocks could be felt nearly 20 hours after the quake, residents sat in groups outside convenience stores watching the news on television sets. Fourteen-year-old Wang Xing sat with her family on chairs by the roadside in the cool night air, a large blanket on her lap.

Wang and her relatives said they planned to spend the night in their cars. “We don’t feel safe sleeping at home tonight,” said Wang, a student. She said the quake left tears on the walls of her family’s house. “It was very scary when it happened. I ran out of my bed and out of the house. I didn’t even have my shoes on.”

Along the main roads leading to the worst-hit county of Lushan, ambulances, fire engines and military trucks piled high with supplies waited in long lines, some turning back to try other routes when roads were impassable.

Rescuers turned the square outside the Lushan County Hospital into a triage center, where medical personnel bandaged bleeding victims, according to footage on China Central Television. Rescuers dynamited boulders that had fallen across roads to reach Longmen and other damaged areas lying farther up the mountain valleys, state media reported.

The China Earthquake Administration said at least 156 people had died, including 96 in Lushan. In the jurisdiction of Ya’an, which administers Lushan, 19 people were reported missing and more than 5,500 people were injured, the administration said.

The quake — measured by the earthquake administration at magnitude-7.0 and by the U.S. Geological Survey at 6.6 — struck the steep hills of Lushan county shortly after 8 a.m., when many people were at home, sleeping or having breakfast. People in their underwear and wrapped in blankets ran into the streets of Ya’an and even the provincial capital of Chengdu, 115 kilometers (70 miles) east of Lushan, according to photos, video and accounts posted online.

The quake’s shallow depth, less than 13 kilometers (8 miles), likely magnified the impact.

Chengdu’s airport shut down for about an hour before reopening, though many flights were canceled or delayed, and its railway station halted dozens of scheduled trains, state media said.

Lushan reported the most deaths, but there was concern that casualties in neighboring Baoxing county might have been under-reported because of inaccessibility after roads were blocked and power and phone services cut off.

As the region went into the first night after the quake, rain started to fall, slowing rescue work. Forecasts called for more rain in the next several days, and the China Meteorological Administration warned of possible landslides and other geological disasters.