Portland, OR – Portland police declared a riot and cancelled the permit for a conservative rally after Antifa protesters attacked the group on Saturday afternoon (videos below).

The incident began at about 4 p.m. on June 30, when Antifa counter-demonstrators showed up for a permitted-by-the-city gathering of the Patriot Prayer group at Terry Schrunk Federal Plaza before the rally had even started.

Police began seizing weapons that included utility knives, clubs, and chemical sprays from the masked Antifa protesters before the Patriot Prayer group’s marchers had arrived at the designated location for their demonstration, The Oregonian reported.

When the Patriot Prayer group arrived, mostly via chartered school buses, police checked the new arrivals’ gear and made anyone carrying pepper spray, or anything else that could be used for personal defense, return those items to their bus prior to joining the rally, according to reports on Twitter.

There were twice as many Antifa counter-protesters in attendance as Patriot Prayer group marchers, according to The Oregonian.

When the conservative demonstrators arrived, they sang “God Bless America” and said the Pledge of Allegiance as they waved American flags and showed their patriotism, the videos showed.

Things got nasty at about 6 p.m. when Antifa protesters began throwing eggs, half-empty water bottles, and lit firecrackers into the crowd, according to The Oregonian.

Undaunted, the conservative protesters advanced on the Antifa crew, and pushed them back, videos showed.

Police used pepper-ball guns and flash bangs to disrupt the melee, CBS News reported.

Four civilians and a police officer were injured when they were hit by projectiles hurled by the Antifa protesters, and had to be transported to the hospital, The Oregonian reported.

Portland police responded by declaring the situation to be a “riot,” and shutting down the Patriot Prayer group’s event.

Conservative demonstrators complained that police did not do enough to protect their legally-permitted rally, The Oregonian reported.

Only four arrests were made during the chaos, and none of them were for charges related to the riot, according to The Oregonian. The Antifa protesters who got locked up were all wanted on open warrants.

Watch Antifa protesters attack the Patriot Prayer rally in the videos below: