Around 30 people marched through downtown Hamilton Sunday afternoon, beating drums and protesting against police violence.

The "March Against Police, Their Violence, and All They Stand For" was organized after police shot and killed a 30-year-old woman in a Hamilton apartment last weekend. The SIU is now investigating.

The SIU said officers were responding to an emergency call about a person armed with a knife. One officer used a Taser before another officer fatally wounded the woman with gunfire, the SIU said. The woman died in hospital.

‘Murder is murder, badge or no badge,’ group chants at anti-police march. <a href="https://twitter.com/CBCHamilton?ref_src=twsrc%5Etfw">@CBCHamilton</a> <a href="https://t.co/zup6pHqRnu">pic.twitter.com/zup6pHqRnu</a> —@LauraHowellsNL

The demonstrators stopped for a moment of silence outside that apartment, which is above an e-cigarette store on King Street E. near Wellington Street N.

"Who do you call when the police assault you?" they chanted before standing in silence.

Police fatally shot a woman last week in an apartment on King Street E. near Wellington Street N. (Laura Howells/CBC)

The march was to "stand in solidarity with all victims and survivors of police brutality, in Hamilton and beyond," said a statement by Feminist Action Hamilton, the collective that organized the demonstration.

Organizers did not want to speak to CBC News.

‘Who do you call when police assault you?’ demonstrators chant in Hamilton. Police fatally shot a 30-year-old woman in an apartment last weekend. <a href="https://twitter.com/CBCHamilton?ref_src=twsrc%5Etfw">@CBCHamilton</a> <a href="https://t.co/xmIrZ1QL9u">pic.twitter.com/xmIrZ1QL9u</a> —@LauraHowellsNL

"Murder is murder, badge or no badge." was among the group's chants, as officers rode on bicycles ahead and behind them.

There have been police shootings over the past several years in Hamilton.

Earlier this year, Hamilton police shot and killed 19-year-old Quinn MacDougall, after reports of a threat in progress involving a weapon. He was the one who had called police for help, apparently after become distraught over some threats he had received via social media.

Something 'obviously broken'

"I have lots of positive feelings for the police, but there's an element that's obviously broken and it needs to be addressed," said Sheldon McGregor, who attend the march.

"For people who are in marginalized groups...they are doing things that are not acceptable in today's society."

Sheldon McGregor said police need more education and tools to deal with marginalized groups and situations involving mental health. (Laura Howells/CBC)

McGregor said his own child was the victim of unprovoked police violence, resulting in serious injury. He said an SIU investigation did not lead to disciplinary action.

"The police officers involved should have been in someway reprimanded for what they did," he said.

McGregor said officers need better education and tools to deal with mental health situations and people in other marginalized groups, so they don't use violent approaches. He added there needs to be a "fair but stern" process for officers that cross the line.

Feminist Action Hamilton emphasized they are not speaking on behalf of the woman who was killed last week.

The demonstrators marched behind a banner that said, "Feminists against police. Cops don't keep us safe." (Laura Howells/CBC)

The SIU has assigned six investigators and three forensic investigators to the case from last weekend, which involves one "subject" officer and two officers who witnessed the incident.

The SIU is an arm's length agency that investigates reports involving police where there has been death, serious injury or allegations of sexual assault.