Police say a suspect and a K9 officer were killed Sunday night in Minnesota. Detectives said an officer was also injured.

According to authorities, officers were responding to a domestic assault in the town of Duluth when a man started shooting from inside the home. Negotiations were attempted, but police say the suspect fired, injuring an officer and killing his K9 partner. An officer then returned fire, investigators said.

Upon gaining access to the room where the suspect was located, police found the man dead, according to police reports.

The injured officer has been released from the hospital, authorities said. The Minnesota Bureau of Criminal Apprehension is investigating.