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Protesters at a climate rally in Vancouver on Oct. 7, 2019 organized by Extinction Rebellion.

Protesters shut down traffic on major bridges across Canada on Monday as they joined in an international day of action meant to galvanize governments into taking more urgent action on climate change.

Activists with the environmental group Extinction Rebellion blocked traffic on spans in Halifax, Toronto, Edmonton and Vancouver, with similar demonstrations planned for Montreal, Calgary and Victoria later in the day.

The Canadian protests did not attract the same numbers seen in some European cities where hundreds of activists turned out in force, but nonetheless sparked anger among people caught up in major traffic delays.

Extinction Rebellion's Toronto chapter said disrupting traffic was a necessary, if inconvenient, tactic.

"In a car-dependent city, interfering with traffic is one of the best ways of interfering with business as usual," the group wrote in a Facebook post.

"We are not attempting to shame or blame drivers -- we all live in a toxic system and have few good options in our daily lives without system change."

The Toronto group was scheduled to clear off the bridge by 10 a.m., but were still gathered by mid-day. Toronto police Const. Caroline De Kloet said officers began making arrests after noon but did not say how many.

In Edmonton, a handful of protesters linked arms to block traffic on the Walterdale Bridge connecting the city's south side with the downtown core.

Police kept the peace between activists and angry drivers, some of whom got out of their cars to yell obscenities.

Alberta Premier Jason Kenney criticized the protesters on Twitter, saying they were preventing workers from reaching their jobs and barring parents from taking kids to school.

"Somehow this is all supposed to be in the name of environment, but hundreds of cars are now idling unnecessarily as they wait," he wrote.

The scene was more peaceful at Halifax's Angus L. Macdonald Bridge, even when police moved in about four hours after the demonstration got underway.

Officers arrested 18 people positioned on the artery linking the city to nearby Dartmouth. Early in the day, police said less than a hundred protesters, many of them waving flags and signs, had gathered near the toll plaza on the Dartmouth side.

The Macdonald bridge was reopened to traffic by mid-day.

"I think this is a huge success," protest organizer Patrick Yancey said just moments before he was arrested.

"I think it's going to be great for the whole world to see all of the people who are willing to make this sacrifice in order to get some action on this climate crisis."

Lorna McLagen of Annapolis Royal, N.S., was also among the group arrested. She said she felt compelled to act.

"I've been part of the problem for so long and now, before I die, I'd like to try to do something," said McLagen. "As uncomfortable as it makes me feel, I have to do it."

Extinction Rebellion members usually sit or lie down in front of traffic until they are arrested and taken away by police officers. Such a scene played out in cities around the world throughout Monday, although some saw more dramatic efforts.

Protesters in New York doused the city's famous charging bull statue with fake blood as part of their disruption.

Demonstrators playing steel drums marched through central London as they kicked off two weeks of activities designed to disrupt the city.

In Paris, hundreds either locked arms or chained themselves together in the city's central square, while in Berlin about 1,000 people gathered before dawn to block the Grosser Stern, a traffic circle in the middle of the German capital's Tiergarten park.

Founded in Britain last year, Extinction Rebellion, also known as XR, now has chapters in some 50 countries. The group said the protests Monday were taking place in 60 cities worldwide.

-- With files from Keith Doucette in Halifax, Tim Cook in Edmonton and The Associated Press

This report by The Canadian Press was first published Oct. 7, 2019.