Helena, Mont. | An earthquake damaged an apartment building and knocked bricks off the facades of Main Street buildings in southwestern Montana on Tuesday, authorities said.

The 4.6 magnitude quake, reported at 9:46 a.m., was centered about nine miles northeast of Sheridan.

It was felt in Helena and as far away as Idaho, according to the U.S. Geological Survey Web site.

One Sheridan family was evacuated from their damaged downtown apartment until it can be proven safe, said Frank Ford, Madison County's former emergency management director.

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