WINDSOR, Ontario (AP) — A tense standoff at a U.S.-Canadian border bridge eased somewhat Saturday after Canadian police persuaded demonstrators to move the trucks they had used to barricade the busy international crossing. But protesters still blocked access as night fell, snarling traffic and trade between the two countries for a sixth day.

Since Monday, demonstrators angry at COVID-19 vaccine mandates and Prime Minister Justin Trudeau have choked off access from the Canadian side of the Ambassador Bridge linking Detroit and Windsor, Ontario, a major thoroughfare for commerce.

Surrounded by d...