An online poster for an anarchist website hints of May Day unrest in Seattle.
Images posted on pugetsoundanarchists.org of street disorder and a rock leave little doubt self-described anarchists could turn violent.
Seventeen people were arrested on May 1, 2013 when evening street violence followed a day of peaceful demonstrations.
On Wednesday, Seattle Police commanders will brief the Seattle City Council about plans for May Day.
"We are concerned," said councilmember Bruce Harrell, who chairs the committee that oversees public safety.
"We don't underestimate the anarchists. They destroy property on occasion so we want to make sure we are on our A game," Harrell said.
A memo to the council from Interim Police Chief Harry Bailey said Capt. Chris Fowler will again lead the May Day response.
The memo says SPD will have Force Investigation Team members "readily available during the May Day event to address use of force issues that might arise."
Harrell said he wants police to communicate with the community before May Day about their parameters for using force.