CALEDONIA, Ont. -- Protesters calling for action on missing and murdered aboriginal women have closed stretches of two highways in Ontario.

Provincial police say demonstrators have blocked part of Highway 6 between Caledonia and Hagersville and at the Skyway Bridge on Highway 49 connecting Tyendinaga Territory and Prince Edward County.

The protests come on what's billed as a national day of vigil for missing and murdered aboriginal women and girls.

Six Nations Men's Fire, which is organizing the planned two-day Highway 6 closure, is calling on the federal government to hold an inquest into the matter.

OPP say their objective is to maintain the safe flow of traffic and, when delays occur, get traffic flowing again in the safest manner possible.

Police say they are working with protest groups to let demonstrators safely and peacefully exercise their right to protest while minimizing the impact on the travelling public when possible.