DULUTH, Minn. (AP) -- A man who refused to surrender to Duluth police during a roughly 20-hour standoff is dead after shots were fired.

The Minnesota Bureau of Criminal Apprehension called the incident an officer-involved shooting but did not specify whether the man was killed by police fire.

The standoff began at about 8:30 p.m. Thursday after police responded to a report of an assault and a man inside refused to surrender. Officers sent in a police dog, Luna, but the man began shooting and Luna was killed.

Reports say gunshots were heard before 5 p.m. Friday. The bureau tweeted shortly before 6 p.m. that the man was deceased.

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