ANACONDA, Mont. — It’s not hard to disappear in the rugged mountains of southwestern Montana, where authorities have spent four days hunting for an Army veteran accused of opening fire in a neighborhood bar.

The roads west of the small town of Anaconda in Deer Lodge County, where four people were killed in the shooting early Friday, feed into rough terrain filled with hunting cabins, hiking trails, tall trees and the state’s largest national forest.

“I can totally see how somebody could park a car and disappear,” said Erin Hansen, 45, a high school teacher who often hikes there.

The shooting suspect, Michael P. Brown, 45, grew up in the county, which has a population of about 10,000, and has lived there since returning about two decades ago, after his Army service. Authorities say he is

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