As the authorities began what appeared to be an operation to clear the crossing at the Ambassador Bridge, on the other side of the Atlantic, in Paris, the police fired tear gas at demonstrators blocking traffic on the Champs-Élysées at a copycat protest.

The Windsor Police wrote on Twitter Saturday morning that “The Windsor Police & its policing partners have commenced enforcement at and near the Ambassador Bridge.” It added: “We urge all demonstrators to act lawfully & peacefully.”

Police officers were standing in a line not far from the protesters on Saturday morning. Some protesters dismantled a tent where they had kept food and supplies. Some of the protesters blared their horns and others sang the national anthem, “O Canada.”