EVANSTON, Ill. - Evanston Mayor Daniel Biss has been speaking out after graphic and violent altercations between federal immigration agents and protesters in his community last Friday.

Some of the viral videos show agents striking and pointing guns at onlookers.

What we know:

Biss said Evanston police are in the early stages of investigating what happened on Halloween.

When the videos showed agents violently beating a U.S. citizen after a car crash at the intersection of Oakton and Asbury in Evanston, the Department of Homeland Security laid the blame on protesters and onlookers. DHS said agents detained three U.S. citizens and five undocumented immigrants during operations in Evanston and neighboring Skokie on Friday.

But Biss said he believes the federal agents were out to ter

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