Police informed French environmental group Coalition Climat 21 on Wednesday that the Global Climate March planned in Paris will be cancelled, due to the heightened security situation. The French government said both the Global Climate March on November 29 and other citizen-led climate events planned for December would be prohibited.

The cancellation affects a large number of environmental advocates who were planning to go to Paris. Earlier this week, French Prime Minister Manuel Valls said he wanted groups to call off all other climate-related events aside from the UN COP21 conference, where leaders will meet to hammer out a new legally binding agreement on climate.

The spokesperson for 350.org, an international climate activist group, said citizens would nevertheless find a way to get their message out.