ap photo Truckers and supporters block the access leading from the Ambassador Bridge, linking Detroit and Windsor, as truckers and their supporters continue to protest against COVID-19 vaccine mandates and restrictions, in Windsor, Ontario, Friday.

WINDSOR, Ontario — A judge on Friday ordered protesters at the Ambassador Bridge over the U.S.-Canadian border to end the 5-day-old blockade that has disrupted the flow of goods between the two countries and forced the auto industry on both sides to roll back production.

It was not immediately clear when or if law enforcement officers would be sent in to remove the demonstrators, who parked their pickups and other vehicles in a bumper-to-bumper protest against the country’s COVID-19 restrictions and an outpouring of fury toward Prime Minister Justin Trudeau and his Liberal government.

Chief Justice Geoffrey Morawetz of the Ontario Superior Court said during a virtual hearing that the order would be effective at 7 p.m. to give protesters time to leave.

Windsor police immediately warned that anyone blocking the streets could be subject to arrest and their vehicles may be seized.

The news was met with defiance by protesters.

At the Ambassador Bridge, an unidentified person grabbed a microphone and addressed them, asking if they wanted to stay or leave when the deadline rolled around. By a show of applause, it was agreed they would stay. “OK,”‘ the man said. “Let’s stand tall.” The protesters responded by singing the Canadian national anthem.

The crowd later grew in size and intensity, with flag-waving and frequent chants of “Freedom!” More patrol cars moved in around the site, and police handed out leaflets warning that a state of emergency would come into effect at midnight.

Since Monday, drivers mostly in pickup trucks have bottled up the bridge connecting Windsor to Detroit. Hundreds more truckers have paralyzed downtown Ottawa over the past two weeks; it was a party atmosphere there Friday night, when they even set up a concert stage.

And protesters have also blocked two other border crossings, in Alberta and Manitoba.

The judge’s decision came after a 4 1/2-hour court hearing at which the city of Windsor and lawyers for auto parts makers argued that the blockade was causing undue economic harm for the city and region.

Supporters of the protesters, some of them truckers, argued that an order to disband would disrupt their right to peacefully protest vaccine mandates that hinder their ability to earn a living.

The ruling came in a day of fast-moving developments as federal, provincial and local officials worked simultaneously on different fronts to try to break the standoff with the so-called Freedom Convoy, whose members have been cheered on by the right in the U.S., including Fox News personalities, Donald Trump and Texas Sen. Ted Cruz.