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BOISE — A large earthquake struck central Idaho on March 31, with people across a large area reporting shaking.

The U.S. Geological Survey reports the magnitude 6.5 temblor struck just before 6 p.m. It was centered about 22 miles northwest of Stanley, about 45 miles west of Challis and about 73 miles northeast of Meridian.

There were no immediate reports of damage or injuries.

More than 2 million live in the region that could feel the Idaho quake, according to the USGS, with reports of shaking coming in from as far away as Helena, Montana, and Salt Lake City.

Marcus Smith, an emergency room health unit coordinator at St. Luke's Wood River Medical Center, said the hospital, about 65 miles south of the epicenter, shook but the quake didn't interfere with the treatment of any patients. The hospital in Blaine County is on the front line of Idaho's coronavirus outbreak, in a region with the nation's highest per-capita rates of known COVID-19 cases outside of New York City and its surrounding counties.

“It felt like a wave going through the ground, so I knew right away what it was. It just felt like waves going through the ground,” he said.