In a statement, police did not name the demonstration by name, but said they were responding to “demonstrations” in the city.
“No injuries have been reported and police remain in full control of the city’s streets,” police said in the statement.
More than 500 attendees were expected to travel to Ottawa this weekend, according to event organizers.
Law enforcement officials have been preparing for protests.
Participants were warned by police that displaying hate symbols as swastikas “will result in charges.” The agency also warned that “the targeting of any local event will result in a police and enforcement response.”
The city was paralyzed by the Freedom Convoy protests in January.
Eventually, the protests attracted others who opposed coronavirus restrictions at the time.
Hundreds of vehicles formed convoys heading for Ottawa, and many pedestrian protesters joined the vehicles. The demonstration clogged the downtown area as well as key routes between the United States and Canada.