(CNN) More than a dozen people were arrested Saturday and six others were injured as left-wing anti-fascist demonstrators spent hours counter-protesting against a rally by far-right and extremist groups.

Thirteen people were detained for a variety of charges including disorderly conduct, interfering with police, unlawful use of a weapon, and possession of a weapon on the park, Police Chief Danielle Outlaw said.

Police seized several weapons, including knives, metal and wood poles, chemical spray, and a stun gun, Outlaw said.

It was unclear which groups those arrested were affiliated with.

Outlaw said one person who was injured during the day's events was taken to a hospital. Four other people with minor injuries were evaluated on scene, the chief said.

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