updated 7/26/2005 1:08:46 AM ET 2005-07-26T05:08:46

A magnitude-5.6 earthquake struck southwestern Montana on Monday night, rattling windows and shaking buildings, but there were no immediate reports of any serious damage or injuries.

The U.S. Geological Survey said the earthquake was centered about 23 miles northwest of Dillon. It was felt as far away as Helena, about 120 miles to the north, and some residents of Great Falls, more than 200 miles to the north, also reported feeling the temblor.

In Dillon, Beaverhead County Commissioner Mike McGinley said there were reports of broken glass and other minor damage, but nothing significant.

“We’ve got fire and ambulance personnel standing by” just in case, he said.

The USGS categorized the earthquake as “moderate,” saying initial reports showed it occurred about 25 miles underground.

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