Thousands of Canadian women and girls were murdered or disappeared over nearly half a century in a “genocide”, according to a leaked report of a government inquiry.

Indigenous females face disproportionate violence largely because of “state actions and inactions rooted in colonialism and colonial ideologies”, the document states.

Rights groups have for decades pointed to cases of women and girls vanishing or being killed. A study by the National Institute of Justice found 84 per cent of Native American and Alaska native women have experienced violence in their lifetime and more than half have endured the violence at the hands of an intimate partner.

The inquiry report, due out on Monday but seen in advance by CBC News, says: “We do know that thousands of indigenous women, girls and 2SLGBTQQIA (two-spirit, lesbian, gay, bisexual, transgendered, queer, questioning, intersex and asexual) people have been lost to the Canadian genocide to date.”

It adds: “The fact that First Nations, Inuit, and Métis peoples are still here and that the population is growing should not discount the charge of genocide.”

Murdered and missing indigenous women in US and Canada Show all 11 1 /11 Murdered and missing indigenous women in US and Canada Murdered and missing indigenous women in US and Canada Alaya McIvor Alaya McIvor lost two women close to her as well as experiencing human trafficking, and now speaks out about indigenous rights Alaya McIvor Murdered and missing indigenous women in US and Canada Roberta McIvor Roberta McIvor, cousin of Alaya, was killed in Manitoba, Canada, in 2012 Alaya McIvor Murdered and missing indigenous women in US and Canada Laney Ewenin memorial A memorial for Eleanor 'Laney' Ewenin who was found dead in 1982 Danielle Ewenin Murdered and missing indigenous women in US and Canada Canada inquiry Families at the National Inquiry in Canada Danielle Ewenin Murdered and missing indigenous women in US and Canada Canada inquiry Families at the National Inquiry in Canada Danielle Ewenin Murdered and missing indigenous women in US and Canada LA MMIW protest Activists march for missing and murdered indigenous women at the Women's March California 2019 Sarah Morris/Getty Murdered and missing indigenous women in US and Canada LA MMIW protest Activists march for missing and murdered indigenous women at the Women's March California 2019 Sarah Morris/Getty Murdered and missing indigenous women in US and Canada Seattle MMIW protest Erandi Flores and Nadia Bucio, both from Mexico and from a group raising awareness for missing and murdered indigenous women, join thousands at a rally at Cal Anderson Park prior to the Women's March on January 20, 2018 in Seattle, Washington. Karen Ducey/Getty Murdered and missing indigenous women in US and Canada LA MMIW protest Activists march for missing and murdered indigenous women at the Women's March California 2019 Getty Images Murdered and missing indigenous women in US and Canada Seattle MMIW protest Thousands listen to speakers raising awareness of missing and murdered indigenous women at a rally at Cal Anderson Park prior to the Women's March on January 20, 2018 in Seattle, Washington. Across the nation hundreds of thousands of people are marching on what is the one-year anniversary of President Donald Trump's swearing-in Karen Ducey/Getty Murdered and missing indigenous women in US and Canada LA MMIW protest A young activist at the Women's March in California, 2019 Sarah Morris/Getty

The report, entitled “Reclaiming Power and Place”, says that “due to the gravity of this issue,” the inquiry is preparing a “supplementary report on the Canadian genocide of indigenous peoples according to the legal definition of genocide,” which will be posted at a later date on the inquiry website, CBC News reported.

Running to over 1,200 pages it carries at least 230 recommendations.

It comes after two and a half years of work by the National Inquiry into Murdered and Missing Indigenous Women and Girls, ordered by Justin Trudeau, the Canadian prime minister.

Estimates have put the number of indigenous women and girls who have disappeared or been murdered in Canada since the 1970s at up to 4,000, but the inquiry report says the true number may be impossible to establish.

From 2005 to 2010, the Sisters In Spirit Initiative said it confirmed 582 cases of missing and/or murdered indigenous women and girls over 20 years.

The murder of 15-year-old Tina Fontaine in the summer of 2014 gave fresh impetus to calls for a national inquiry. By 2015, the UN backed a public inquiry.

To produce the new report, the inquiry held 24 sessions, attended by at least 2,380 people, including family members of those killed or missing.

The missing and murdered indigenous women (MMIW) issue involves indigenous people in Canada and the US, including the First Nations, Inuit, Métis and Native American communities.

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The inquiry website says: “Shining a light on all the causes of violence, murders and disappearances is a daunting task. But it is a necessary one. We are exposing hard truths about the devastating impacts of colonisation, racism and sexism – aspects of Canadian society that many Canadians are reluctant to accept.”

Robert Pickton, one of the world’s most notorious serial killers, who was jailed in 2007, said he butchered 49 women at his farm near Vancouver.

It was claimed that police had not taken the disappearances seriously because the women were sex workers and mostly from Canada’s indigenous community.

The death in 1971 of Helen Betty Osborne, 19, a Cree Aboriginal woman who was abducted and murdered in the street in Manitoba, prompted the wave of campaigning that finally culminated in the inquiry’s launch.

In her wake came thousands of cases of deaths and disappearances that activists say were not properly investigated.

They range from the deaths of Gloria Moody, 27, in 1969 to that of 14-year-old Aielah Saric-Auger in 2006. The Sisters in Spirit movement published a report in 2009 of the personal stories of the women and girls.