Portland Police posted a photo of the items on Twitter, adding that someone had pointed out the bag to officers at Lownsdale Square Park on Sunday night.

Officers were investigating a report of shots fired in the park when a passerby “pointed out a suspicious bag to them,” police said in a news release.

“The origin of this ammunition and these destructive devices is under investigation,” police said.

Two people were arrested on Sunday after a shot was fired in the park near SW 4th Avenue and SW Salmon Street.

Officers responded just before 7:30 p.m. While they were securing the scene, a person thought to be the victim arrived at a hospital in a private vehicle with a gunshot wound that is non-life-threatening, police said.

Police didn’t say if they believed the shooting or the bag that was found were connected to protests outside the Mark O. Hatfield United States Courthouse, which has become a flashpoint since federal agents were sent to the city to protect federal property.

President Donald Trump said he sent federal agents to Portland to quell the unrest, but local and state officials have said they are only exacerbating the situation.

Federal agents have repeatedly fired tear gas at protesters—including a crowd last week that included Portland Mayor Ted Wheeler who said he saw no justification for the force.

Portland police declared a riot early Sunday morning, saying protesters breached a fence that had been erected to protect the federal courthouse where agents have been stationed.

In the hours leading up to the riot being declared, police said people in the crowd spent the night “shaking the fence around the building, throwing rocks, bottles, and assorted debris over the fence, shining lasers through the fence, firing explosive fireworks into the area blocked by the fence, and using power tools to try to cut through the fence.”

On Sunday night, a crowd of around 1,000 gathered again for the 60th consecutive night of protests against police brutality and racism since George Floyd, a Black man, was killed in Minneapolis police custody on May 25.