PORTLAND -- After several incidents, police are on a round-the-clock presence with four officers at a time at the 'Occupy Portland' encampments.
Another march sponsored by the AFL-CIO was announced for October 26 at 5 p.m.
Mayor Sam Adams said Thursday there were no plans to put an end to the protest.
The activists have settled into Chapman and Lownsdale Square parks with no announced plans to depart. Organizers estimate as many as 500 people have been living there.
They are unfortunately not the only people who have lost their jobs, their homes and have to camp in Portland ... we can't evict everybody in Portland who has to sleep outdoors, Adams said.
City Hall:Q&A on 'Occupy Portland'
If suddenly their activities change tomorrow, [@ Occupy Portland] we might change our approach. Behavior matters in terms of how we strike that balance with our discretion.
During one confrontation onWednesday, a witness told investigators a man was holding a handgun and walked towards SW 3rd and Salmon. Police took the unidentified man into custody and later said he had a concealed weapons permit.
Raw video:Fight leads to 'Occupy' arrest(Warning:graphic)
Police previously hauled away a man Tuesday afternoon from Chapman Square Park on an accusation of dealing marijuana.
Adams said even medical marijuana usage was not allowed in public parks.
We don't pretend that there are unsavory aspects to Occupy Portland, but we do suggest that these aspects are not unique to our protest or movement, spokesman Jordan Ledoux said. While all of these have been actual events that happened, they certainly, as anyone who has attended General Assembly will attest, do not represent a valid cross-section of those involved.
Details:Mayor: No pot
Police Chief Mike Reese said he has been meeting regularly with 'Occupy' organizers, who acknowledge the overnight issues.
Officers use discretion but we are going to cite people and if well have to, we'll exclude folks if they can't obey our park rules, Reese told KGW.
We're enforcing the law particularly around drug and alcohol issues, Reese said, That's a problem in a crowd dynamic like this. We don't want people that engage in aggressive behavior and we don't want people hurt. And, I think all of us agree that drug and alcohol use would be the wrong thing at this type of event. Other problems have arisen.
A nine-year-old girl was reported missing for about 40 minutes Tuesday evening. Her mother, living in Lyndel Park, said and the girl had gone off with a woman named 'Rainbow' to the occupation's art tent.
Damage to parks property and threats to low-income workers who clean the park restrooms have also arisen.
Ed Blackburn, director of Central City Concern, an agency that's helps the drug-addicted who clean about 220 city blocks, said cleaning was temporarily stopped at the parks after a recent incident. Crews returned shortly to complete their work.
There have been no problems up until a couple days ago, he said, when one of our workers was about to clean the bathroom in the park and encountered a couple of people who were not friendly and doing some heckling.
Blackburn said there hasn't been a problem for his workers since then. Encounters with 'Occupy Portland' activists have been cordial.
Commissioner Nick Fish, in charge of the parks bureau, sent a letter recently to 'Occupy Portland' organizers citing concerns about what he estimated about $19,000 in damages to date to the two parks.
Tuesday, parks crews put up a mesh barricade around a statue and fragile landscaping in Lownsdale Park.
I think each city (nationwide) is experiencing something a little different with this movement, Chief Reese said, We're taking it day by day.