An eastern Iowa man shot and killed an armed man who broke a basement window and entered his home, authorities said Thursday.

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Monticello police were called early Wednesday morning to a home were a man later identified as Patrick O'Brine was found dead, Jones County Attorney Kristofer Lyons said in a statement.

Police said O'Brine broke out a window and entered the basement of a home. A resident, who was home with his 10-year-old son, saw O'Brine and fired three shots at the intruder, hitting him twice.

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O'Brine, who was armed and wearing a mask, died at the home.

Lyons said an investigation of the shooting is continuing but that evidence supports a conclusion that the resident was justified in using deadly force.