An official crowd estimate was not available for Saturday’s SB1070 protest in Phoenix, Arizona, but officials overheard on the police scanner estimated the crowd at about 30,000. The march, organized by National Day Laborer Organizing Network and PUENTE Learning Center, called on President Obama to nullify SB1070 and block the Department of Homeland Security from taking custody of anyone charged with violating provisions of the law. SB1070 is set to take effect July 29. Demonstrators prepare to march through downtown to protest Arizona’s SB1070 on May 29, 2010 in Phoenix, Arizona. Organizers were predicting 50,000 people would participate in the march. (Photo by Scott Olson/Getty Images) (AP Photo/ Paul Connors) Photo by Lungstruck Flickr photographer Lungstruck snapped this picture and believes the Department of Homeland Security also had a presence at the protest.

"A DHS (Department of Homeland Security?) police officer walks through downtown Phoenix not far from the Immigration rally. I wasn’t able to find out much on DHS police, I don’t know if it’s part of the Phoenix police or an entirely separate entity."

Supporters of SB1070 also made it to Arizona and held their on counter-protest.