Police in Portland, Oregon, declared a riot and ordered participants in a march by Patriot Prayer to disperse after officers saw assaults and projectiles being thrown. Police said Saturday that some arrests were made at the downtown protest, reports the AP. The problems occurred as two opposing protest groups—Patriot Prayer and antifa—took to the streets; the former group had a permit to march, and was organized by US Senate candidate Joey Gibson. Antifa met the marchers by throwing eggs and water bottles, and lighting firecrackers and smoke bombs, notes the Oregonian, and police used flash bangs in an effort to disperse the clashing protesters. Police revoked Patriot Prayer's march permit, and four people were hospitalized. (More immigration stories.)