GATINEAU, Quebec — The widespread killings and disappearances of Indigenous women and girls in Canada are a “genocide” for which Canada itself is responsible, a national inquiry concluded in its final report on Monday.

Indigenous people from across Canada cheered, and raised fists and eagle feathers, as the leader of the inquiry announced the report’s findings at an emotional ceremony in Gatineau, Quebec, that was attended by Prime Minister Justin Trudeau. Most in the audience were in traditional Indigenous dress and held red flowers in remembrance of the women.

Some in the crowd were relatives of the disappeared and dead, and were so overcome by emotion that they had to be led away in tears by health care workers.

But despite Mr. Trudeau’s assurances in his remarks that his government would take action on the report’s 231 recommendations — including changes to police practices and the criminal justice system — some Indigenous people expressed skepticism that the report would make much of a difference.