Pregnant black woman shot dead by US cops after calling them for a burglary

A pregnant Seattle woman has been shot and killed by police officers after she called them to report an attempted burglary at her apartment.

The shooting is now the 453rd person to be fatally shot by US police this year, according to a database gathered by the Washington Post.

Charleena Lyles was at home with her three children, and several months pregnant with her fourth, her family told local media.

Police allege she was well-known to the police department and had a note in the system suggesting multiple units respond to the callout.

Audio released of her emergency services call was reporting a burglary at her Magnuson Park apartment, a building for people transitioning out of homelessness.

Two officers arrived and police say Ms Lyles had a knife. Both of them opened fire, in front of several children in her apartment.

Despite an attempt at CPR, Ms Lyles died at her home.

Her sister Monika Williams said Ms Lyles had mental health problems, "but that's no reason for her to be shot".

"There's no reason for her to be shot in front of her babies," she told CBS News.

Ms Williams said Ms Lyle's history was based on a misunderstanding. She had been arrested on June 5 for harassment and obstructing a police officer, after calling officers over an alleged domestic violence incident.

"She had a weapon in her hand because her baby's dad came over and try to fight her. She called the police on him. He was gone and so she went to jail," Ms Williams said.

"[The officers were] talking about they don't know what to do with her, take her to jail, take her to mental health. Take her to mental health! She has mental health issues."

Ms Lyle's family told the Seattle Times they believe her race was a factor in the shooting. Both officers involved were white.

Police Chief Kathleen O'Toole said the shooting will be investigated.