LOUISVILLE, KENTUCKY (REUTERS) - A group of heavily armed black protesters marched through Louisville, Kentucky on Saturday (July 25) demanding justice for Breonna Taylor, a black woman killed in March by police officers who burst into her apartment.

Scores of the demonstrators, carrying semi-automatic rifles and shotguns and clad in black paramilitary gear, walked in formation to a fenced off intersection where they were separated by police from a smaller group of armed counter-protesters.

The black militia dubbed NFAC want justice for Ms Taylor, a 26-year-old emergency medical technician who died in a hail of gunfire when drug investigators bearing a "no-knock" warrant entered her Louisville home four months ago.

One police officer involved in the raid was fired by the city's police department in June.

Two other officers have been placed on administrative reassignment.

No criminal charges have been filed against any of the three.

The leader of the NFAC group, John "Grandmaster Jay" Johnson, called on officials to speed up the investigation into her death and to be more transparent.

"If you don't tell us nothing we going to think you ain't doing nothing," Mr Johnson said in a speech, according to the Louisville Courier Journal.

Ms Taylor's death, which returned to prominence following the May 25 suffocation in Minneapolis police custody of George Floyd, has become a rallying cry in nationwide protests against police brutality and racial bias in the US criminal justice system.

The NFAC first drew attention on July 4 when they rallied in Stone Mountain Park near Atlanta to demand the removal of the giant Confederate rock carving at the site that civil rights activists consider a monument to racism.

In Louisville on Saturday, three members of the group were hospitalised with non-life-threatening injuries when a weapon was accidentally discharged, police said.