Several NYPD officers were injured trying to contain the large mob of Occupy Wall Street protesters. One officer required 20 stitches. New York City Mayor Michael Bloomberg reports that at least seven officers were injured in various incidents. Officer Matthew Walters, 24, was gashed in the left hand when someone in the crowd threw a glass object at him at Zuccotti.

The attack happened as protesters were attempting to take down barriers the NYPD had erected to control the park.

The mayor and Police Commissioner Ray Kelly visited Walters at Bellevue Hospital.

Bloomberg said the protests were not as large as organizers had promoted and that the city had seen minimal disruptions.

“Unfortunately some protesters today have deliberately pursued violence. Demonstrators returned to Zuccotti Park this afternoon and took barriers down that had been erected on Tuesday to allow people in but keep tents and tarps out. Police did meet some resistance when they retrieved those barriers and tried to put them back,” Bloomberg said.

Another five officers were splashed in the face with an unknown liquid. It’s still unclear what the liquid was, but it was believed to be vinegar. Police made an arrest in that incident.

The officers were being treated at a downtown hospital after the liquid attack.

A seventh officer had a hand injury that was not described in detail.

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