WINDSOR, Ontario (AP) — Police moved in to clear and arrest the remaining protesters opposed to COVID-19 vaccine mandates and other restrictions near a key US-Canadian border bridge early Sunday.

Television images showed police arresting the few protesters who remained just after dawn near the Ambassador Bridge linking Detroit and Windsor, Ontario — the busiest border crossing to the US.

Only two pickup trucks and less than a dozen protesters blocked the road to the bridge before police moved in.

Police on Saturday had persuaded demonstrators to move their pickup trucks and others cars that they used at the entrance to the crossing that sees 25 percent of all trade between the two countries, though it remained closed

In the capital, Ottawa, the ranks of protesters swelled to what police said was 4,000 demonstrators. The city has seen that on past weekends, and loud music played as people milled about downtown where anti-vaccine demonstrators have been encamped since late January.

The protests at the bridge, in Ottawa and elsewhere have reverberated outside the country, with similarly inspired convoys in France, New Zealand and the Netherlands, and the US Department of Homeland Security warned that truck convoys may be in the works in the United States.

Trudeau has so far rejected calls to use the military.

“The Prime Minister stressed that border crossings cannot, and will not, remain closed, and that all options are on the table,” Trudeau’s office said in a statement late Saturday after he met with senior officials. Trudeau has called the protesters a “fringe” of Canadian society.

Ottawa police said in a statement late Saturday that a joint command center had now been set up together with the Ontario Provincial Police and the Royal Canadian Mounted Police. They said that would beef up enforcement capabilities that had been limited by “safety concerns — arising from aggressive, illegal behavior by many demonstrators — limited police enforcement capabilities.”

Police earlier issued a statement calling the protest an unlawful occupation and saying they were waiting for reinforcements before implementing a plan to end the demonstrations.

Ottawa Mayor Jim Watson declared a state of emergency last week for the capital, where hundreds of trucks remained in front of the Parliament Buildings and demonstrators have set up portable toilets outside the prime minister’s office where Trudeau’s motorcade usually parks.

On Friday, a judge ordered an end to the blockade of mostly pickup trucks and cars, and Ontario Premier Doug Ford declared a state of emergency allowing for fines of 100,000 Canadian dollars and up to one year in jail for anyone illegally blocking roads, bridges, walkways and other critical infrastructure.

The Ambassador Bridge is the busiest US-Canadian border crossing, carrying 25 percent of all trade between the two countries, and auto plants on both sides have been forced to shut down or reduce production this week. The standoff came at a time when the industry is already struggling to maintain production in the face of pandemic-induced shortages of computer chips and other supply-chain disruptions.