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KANSAS CITY, Mo. — A rally from Republican presidential candidate Donald Trump spawned a large protest demonstration outside the Midland Theatre on Saturday.

While Trump’s speech inside the Midland was periodically marred by disruptive protesters, Trump himself urged his supporters to be peaceful, and even ordered security at the rally not to hurt the protesters. He did announce that he would soon start pressing charges against protesters at his events.

The scene outside became tense, particularly after Trump’s rally had ended.

Kansas City Police Chief Darryl Forte tweeted that police used “foggers” after protesters were seen throwing objects.

Protesters reported members of police crowd control had used pepper spray on the crowd.

Less than an hour after Trump had left the venue, Police Chief Forte tweeted praise for the officers for keeping the scene safe and under control.

Four arrests were made, but the scene so far has been free of any large scale violence.