PORTLAND -- Violence broke out between opposing groups at an anti-white nationalist rally in Portland that left at least one police officer injured, CBS affiliate KOIN-TV reports. Police made several arrests in the city's downtown area as two groups faced off over different views on white nationalism. The Portland Police Department tweeted that marchers and residents should clear the area for their own safety, adding that officers reported protesters attacking photographers and that projectiles were thrown at officers. They said several arrests were made and at least one officer was injured.