Anti-pipeline protesters have blocked access to the Thousand Islands Bridge, a border crossing in eastern Ontario.
Provincial police say those planning to cross to the U.S. at the border point near Kingston should find another route.
Photos from the scene posted on Facebook show a group of protesters carrying a large sign that reads, ``Shut Down Canada.''
They're acting in support of Wet'suwet'en hereditary chiefs, who oppose a major pipeline project that crosses their traditional territory in northern British Columbia.
Another group of protesters shut down a border crossing between Niagara Falls, Ont., and Niagara Falls, N.Y., yesterday.
Other solidarity protests, including a rail blockade in Tyendinaga territory near Belleville, Ont., have shut down train service across swaths of the country.