A request by the New York City Police Department has backfired � in a very public way.

Its request that Twitter users share pictures of them posing with police officers has caused people to start sending in photos of police brutality.

The NYPD sent a tweet on Tuesday, saying it might feature the photographs on its Facebook page.

The responses soon turned ugly when Occupy Wall Street tweeted a photograph of cops battling protesters with the caption �changing hearts and minds one baton at a time.�

Other photos included an elderly man bloodied after being arrested for jaywalking.

Some respondents did send in the type of police-friendly photographs officials were hoping to get.

NYPD spokeswoman Kim Royster says the uncensored and open dialogue was good for the city.

(AP)