Canada was complicit in a "genocide" against thousands of indigenous women and girls over the last 30 years, a government inquiry has claimed.

The National Inquiry into Murdered and Missing Indigenous Women and Girls was established two and a half years ago to investigate the murders and disappearances of thousands of indigenous women over the past three decades.

In a summary report it concluded that through "state actions and inactions rooted in colonialism and colonial ideologies" indigenous women and girls have faced a disproportionately high level of violence.

As many as 4,000 Indigenous women have been murdered over the past few decades, but the report suggested the real figure may never be known.

It linked the deaths to endemic poverty, racism, sexism and addiction social to failed attempts by early colonisers to force indigenous people to integrate.

The 1,200-page report was unveiled on Monday at a ceremony at the Canadian Museum of History attended by Justin Trudeau, the prime minister, and victims' families.

Entitled "Reclaiming Power and Place," the report makes more than 230 recommendations for the government, including giving Indigenous languages official status on par with English and French.

Mr Trudeau made Canada's reconciliation for its colonial past a major part of his 2015 election campaign, and he has apologised for some of the country's historical wrongs since taking office.