The Portland Police Bureau has warned of “robust law enforcement” Sunday afternoon in response to multiple political demonstrations planned downtown.

The U.S. General Services Administration announced Wednesday that it would allow a pro-Trump free speech rally to continue as planned Sunday. Mayor Ted Wheeler had asked the federal agency to revoke the permit in light of last week’s fatal stabbing of three Good Samaritans who intervened in a man’s racial tirade against two teens on a TriMet MAX train. Two of the men died; one continues to recover from his injuries.

The general services administration said the permit was “lawfully obtained” and would be honored. The agency oversees the Terry Schrunk Plaza property across from Portland City Hall, where the rally is set to take place.

Several other groups have announced plans to rally in opposition to the pro-Trump event. Those activities are planned for City Hall and Chapman Square.

On Thursday, police officials said they intend to “provide a safe environment for all participants, non-participants, and community members while ensuring the peaceful exercise of the First Amendment.”

The city hasn't issued permits for any street march. Officials said motorists should be aware of potential disruptions to traffic.

The agency said to expect a heavy police presence “due to online threats of violence between different groups.” Officials advised participants not to bring weapons or items that could be used as weapons to any of the events.

“Prohibited items may be seized by police and, if in violation of city, state or federal law, the possessor may be arrested and charged criminally,” the Portland Police Bureau said in its statement released Thursday.

-- Noelle Crombie

503-276-7184; @noellecrombie