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The American Civil Liberties Union says undercover
police officers posing as protesters staged a violent confrontation
with another officer during the Democratic convention in Denver.

The ACLU said it obtained a police document
showing the undercover officers pretended to struggle with a police
commander so they could be removed from the crowd without blowing
their cover.

The ACLU says another officer thought the commander was being
attacked and pepper-sprayed the undercover officers.

It's not clear how many officers were involved or how they were
affected by the spray.