A timeline of the protests.

The protests engulfing Canada’s capital were set off by the federal government’s requirement that truckers crossing the border from the United States show proof of vaccination against the coronavirus. Here is how the demonstrations have unfolded over the past two weeks.

Jan. 15: Vaccination mandates in Canada have been in effect since Oct. 30 for ship crews, railways and airline workers. But effective Jan. 15, the federal government expanded the requirement to truck drivers returning from the United States. One week later, a reciprocal policy went into effect in the United States for Canadian truckers crossing its border.

Jan. 22: Truck convoy groups departed from British Columbia along the Trans-Canada Highway, a highway system connecting the coasts, en route to Ottawa. Other groups drove from the Prairie and Atlantic provinces.

Jan. 28: The Ottawa police estimated that 1,000 to 2,000 people arrived in the capital and took part in protests over that weekend, on Jan. 29 and 30.

Jan. 29: A separate standoff emerged in Western Canada between truckers and the police at the U.S. border crossing in Coutts, Alberta. The local Royal Canadian Mounted Police detachment said the peaceful protest devolved into an “unlawful blockade.”

Feb. 5-6: The police estimated that 5,000 people protested in Ottawa and that 1,000 vehicles clogged the streets. While the core group has been parked outside the Parliament building in Ottawa, protesters also organized rallies in other Canadian cities over the weekend, including in Toronto, Quebec City and Calgary.

Feb. 6: Jim Watson, the mayor of Ottawa, declared a state of emergency.

Feb. 8: Ottawa police said they had made 23 arrests and issued 1,300 tickets in connection with the protests.