Justine Damond, also known as Justine Ruszczyk, from Sydney, is seen in this 2015 photo released by Stephen Govel Photography in New York, US, on July 17, 2017. [Photo/Agencies]

The Star Tribune, citing three people with knowledge of the shooting it did not name, said the officers pulled into the alley in a squad car, and Damond talked to the driver. The newspaper's sources said the officer in the passenger seat shot Damond through the driver's-side door. A BCA spokeswoman did not return messages seeking to confirm that account.

Neighbor Joan Hargrave called the killing "an execution" and said there was no reason for a well-trained officer to see Damond as a threat.

"This is a tragedy — that someone who's asking for help would call the police and get shot by the police," Hargrave said.

Officials said the officers' body cameras were not turned on and that a squad car camera did not capture the shooting. Investigators were still trying to determine whether other video exists.

It's not clear why the officers' body cameras were not turned on. The department has phased in body cameras for all of its officers over the last year. Department policy allows for a range of situations in which officers are supposed to turn cameras on, including "any contact involving criminal activity" and before use of force. If a body camera is not turned on before use of force, it's supposed to be turned on as soon as it's safe to do so.

Once the investigation is complete, Hennepin County Attorney Mike Freeman would decide whether to charge the officer. Freeman would not comment on the broader case Monday, but said both officers likely should have turned on their body cameras as they were approached by Damond in an alley.

Police Chief Janee Harteau called the killing a "tragic death" and said she understands why the community has questions. "I've asked for the investigation to be expedited to provide transparency and to answer as many questions as quickly as we can," she said.

The Fulton neighborhood where the shooting happened is a mix of middle- and upper-middle-class homes about a half-mile from city lakes that are a popular destination for residents and tourists.

Some 50 friends and neighbors gathered in a semicircle Sunday near the shooting site, with many more looking on from the sidewalk and street. Chalk hearts containing the names of some people who were victims of police violence were drawn on the driveway.

By Monday, flowers had also been left at the scene, along with a handwritten sign that asked, "Why did you shoot and kill our neighbor?"Damond's death is yet another high-profile police shooting in the Twin Cities area in recent years. Last year, 32-year-old Philando Castile was killed by an officer during a traffic stop in a nearby suburb after he told the officer he was armed. And in November 2015, a Minneapolis police officer shot and killed Jamar Clark during a struggle in which the officer said Clark grabbed his partner's weapon.

Damond's business website indicates that she relocated to Minneapolis and worked as a yoga instructor, meditation teacher and personal health and life coach.

Nancy Coune, administrator at the Lake Harriet Spiritual Community in Minneapolis, said Damond came to Minneapolis about three years ago to be with her fiancé, and she had been teaching and speaking at the center for more than two years.

Damond's mother was Australian, and she spent her formative years there, but also spent some of her early childhood in the Buffalo, New York, area, said Peter Suffoletto, a cousin of Damond's father.

AP