A 5.8 magnitude earthquake rocked a small town in western Montana shortly after midnight on Thursday, according to the U.S. Geological Survey.
The earthquake's epicenter was about 6 miles southeast of Lincoln, which has a population of about 1,100, according to the USGS.
It was the state's largest recorded earthquake in more than 10 years.
A 4.5 magnitude aftershock struck the area about 30 minutes later. The initial quake lasted about 13 seconds, according to some reports.
Twitter users in Spokane, Washington — about 300 miles west of Lincoln — wrote that they felt the quake's impact there. The National Weather Service in Great Falls said on Twitter that the impact was felt up to 500 miles away.
Police said the quake knocked out power for some residents in Lincoln and caused at least one gas leak in the capital, Helena.
There were no immediate reports of injuries, according to the Lewis and Clark County Sheriff’s Office.
Ray Anderson, 76, told The Associated Press on Thursday that it was the strongest quake he has felt while living in Helena.
Singer and guitarist John Mayer, who has a home in Bozeman, tweeted, "Wow. Earthquake in Montana."
Wow. Earthquake in Montana. So if you wonder if you're crazy and you're searching the words earthquake and Montana, earthquake Montana.— John Mayer (@JohnMayer) July 6, 2017