At least three people were arrested as activists held dueling pro- and anti-President Trump rallies in Portland, Ore., just over a week after two men were stabbed to death trying to stop an anti-Muslim tirade aboard a MAX train.

A heavy police presence was reported along the streets near City Hall, and authorities warned participants against bringing anything that could be considered a weapon to any of the events.

The Portland Police Bureau asked those demonstrating against the president, as well as his supporters, to keep themselves separated in order to prevent growing tensions.

Police working to keep all groups separated. Protesters should stay with their groups, not attempt to cross streets to escalate tensions. — Portland Police (@PortlandPolice) June 4, 2017

Authorities said three people have been arrested ahead of the rallies, while several items that could be used as weapons have been confiscated from the crowds.

These are some of the items that have been seized so far today. pic.twitter.com/VsfenLPZhS — Portland Police (@PortlandPolice) June 4, 2017

Some projectiles have been thrown by unknown persons in Chapman Square. — Portland Police (@PortlandPolice) June 4, 2017

Two men were fatally stabbed in Portland last month after trying to intervene and stop a third who was yelling anti-Muslim slurs at two women at the beginning of the Muslim celebration of Ramadan.

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Trump condemned the stabbings three days after the attack occurred, calling it "unacceptable."

The violent attacks in Portland on Friday are unacceptable. The victims were standing up to hate and intolerance. Our prayers are w/ them. — President Trump (@POTUS) May 29, 2017

Sen. Jeff Merkley Jeffrey (Jeff) Alan MerkleyThe Hill's Morning Report - Sponsored by The Air Line Pilots Association - Trump, Biden renew push for Latino support Sunday shows - Trump team defends coronavirus response Oregon senator says Trump's blame on 'forest management' for wildfires is 'just a big and devastating lie' MORE (D-Ore.) denounced a possible violent clash between protesters shortly before the rally began.

Hate and intolerance are not welcome in Oregon ever, and especially now. https://t.co/CiDKdw730h — Senator Jeff Merkley (@SenJeffMerkley) June 4, 2017

Portland Mayor Ted Wheeler (D) urged for the pro-Trump "free speech" rally to be canceled after the stabbing incident, saying the event could "peddle a message of hatred.” Federal officials denied his request.

A Facebook page for the event listed speakers including Kyle Chapman, a self-described American nationalist as well as a strong Trump supporter.

The organizer of the rally, Joe Gibson, began the event by honoring the two men who died, saying they are heroes who “gave it all,” the Seattle Times reported.

-Updated: 5:53 p.m.