DULUTH — A police officer who the city once tried to fire for shooting an unarmed man through a door has been under investigation for a pair of sexual assault allegations, authorities confirmed Wednesday.

The St. Louis County Attorney’s Office earlier this year declined to file criminal charges against Tyler Leibfried, but the Duluth Police Department is continuing an internal investigation that could potentially result in discipline for any violations of city and department policies.

“We take allegations against our officers very seriously and investigate each complaint thoroughly,” Chief Mike Ceynowa said in a news release.

Redacted investigative documents released by the Minnesota Bureau of Criminal Apprehension reveal that a woman first reported an alleged assault by Leibfried to

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