RIO DE JANEIRO — Several dozen heavily armed miners dressed in military fatigues invaded an indigenous village in remote northern Brazil this week and fatally stabbed at least one of the community’s leaders, officials said Saturday.

The killing comes as miners and loggers are making increasingly bold and defiant incursions into protected areas, including indigenous territories, with the explicit encouragement of Brazil’s far-right president, Jair Bolsonaro. Officials warned the conflict could escalate in the coming hours.

Mr. Bolsonaro has said that indigenous communities are in control of vast territories that should be opened up to industries to make them profitable.

Land invasions in indigenous territories are on the rise across Brazil, where indigenous leaders say they regularly come under threat by miners, loggers and farmers. Yet assassinations of indigenous leaders are rare.