May Day demonstrators pepper sprayed — Police in Portland said an increasingly unruly May Day crowd hurled projectiles and chairs at officers Friday evening. Earlier, police temporarily closed a major city bridge and used pepper spray on some demonstrators when a march deviated from its permitted route through downtown. Police said one officer was assaulted and injured and taken to a precinct for medical treatment. The Burnside Bridge over the Willamette River was closed about 5:30 p.m. during the height of the evening commute. It later reopened. Hundreds of protesters were reported in the evening crowd. Earlier in the day, hundreds took to the streets to celebrate International Workers’ Day and protest police violence.

Coastal volcano — Geologists say a volcano may be erupting 300 miles off the Pacific Northwest coast. Oregon State University scientist Bill Chadwick predicted the Axial Seamount would erupt this year, and though he won’t be able to confirm that it has until he makes the trip out to the seamount, all signs point to an eruption on April 24. On April 24 there was a spike of nearly 8,000 quakes at Axial Sea, normally there are about 300. Chadwick and his team measured the changes with sensors laid on the seafloor last year. Officials say an eruption is not a threat to coastal residents because the earthquakes are small and seafloor movements are gradual, so they won’t cause a tsunami.

Horse virus — The state has quarantined a stable with 20 horses in Marion County after one was hospitalized with a serious viral disease. The Oregon Department of Agriculture said the disease is the neurological form of equine herpesvirus, or EHV-1. It’s highly contagious and widespread among horses. It can cause respiratory and neurologic disease, abortions, and in severe cases death. It doesn’t sicken humans. The horse has been treated at Oregon State’s Large Animal Hospital. They said there’s no indication the disease had spread outside.