http://www.bbc.com/news/world-australia-40627847
The Minnesota Department of Public Safety (BCA) said police responded to "a call of possible assault" when "at one point an officer fired their weapon, fatally striking a woman".
The BCA is investigating the Saturday incident but said the officers' body cameras were not turned on at the time.
The victim has been identified by Australian officials as Justine Damond.
According to Australian media, the 40-year old woman was living in Minneapolis with her fiancé. The woman called 911 to report a noise near her home when the incident occurred, reports said.