Video of the late April vandalism attack along Valencia Street that recently surfaced has sparked outrage in San Francisco.

The clip chronicles violence in the Mission on April 30th where some merchants said police didn't do enough to stop the attack.

The black bloc anarchist protesters vandalized businesses under the cover of darkness and in disguise. A group calling itself Anarcha  L-A posted an 11-minute video of the riot on YouTube. 

Michell Horneff-Cohen,  the owner Property Management Systems, told KTVU protestors broke five windows and carved an "A" for anarchy into a sixth window.

Horneff-Cohen said she's seen the YouTube video and would like to see those responsible brought to justice. But as far as she knows, only one man was arrested and later relased.
 
"I just wish we could use that video to arrest people, to stop them from doing it in the future," Horneff-Cohen said. "It's frustrating."

A few doors down, KTVU showed the anarchist video to the store manager at Nooworks clothing store.

Gwen Lutz found the video upsetting. She said she doesn't understand why protestors targeted small businesses and why police failed to stop the vandalism.

"It's just crazy to me that it started at the police station and make it all the way down here," said Lutz.  

Police officials said they have seen the video, but would not comment on specifics.

In a written statement, the department said: "This video could potentially yield information or evidence for the investigation."

Horneff-Cohen was disappointed by the inaction.

"If the same occurence happend again, I would expect the same results," she said. The business owner describes  the experience as draining and time consuming.

The group that posted the video on YouTube does not claim responsibility.