A convoy of truckers and others who oppose vaccine mandates has rolled into Ottawa for a weekend of rowdy protests, putting Canada’s capital city on edge amid warnings from police that they don’t know how large the crowds will get.

Saturday saw thousands of protesters pile into downtown Ottawa and onto the grounds of Canada’s Parliament buildings, while a long line of big rigs, pickup trucks, RVs and other assorted vehicles trickled through the streets blasting on their horns, bringing gridlock to the city core.

The protest group has attracted an unusual amount of international attention, having been championed on prime time Fox News shows, Joe Rogan’s podcast and Elon Musk’s Twitter feed.