When a Jefferson County deputy unleashed pepper spray at unruly protesters on the first night of the Democratic National Convention, he did not know that his targets were undercover Denver police officers.

Now the American Civil Liberties Union of Colorado is questioning whether that staged confrontation by police pretending to be violent inflamed other protesters or officers during the most intense night of the four-day event.

The protest occurred Aug. 25 at 15th Street and Court Place near Civic Center. Police ultimately arrested 106 people, the highest number of arrests in a single day during the convention.

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