The partial implementation of the Arizona immigration law, SB1070, began today in earnest, and already we’re seeing the friction between supporters and immigration rights advocates play out. Adam Sarvana, a spokesman for Rep. Raul Grijalva (D-AZ), an outspoken critic of the law, just sent out this release:

The Yuma district office of Rep. Raúl M. Grijalva has been closed for the day because of recent vandalism. A shattered window and bullet inside the office were found earlier today. Police are investigating the incident and have not released details about a potential motive. Rep. Grijalva intends to open the office again as soon as possible.

On the day that Arizona Gov. Jan Brewer signed the legislation, Grijalva closed his district offices because of threats. So this is nothing new.

In Phoenix, hundreds of protesters blocked one of Sheriff Joe Arpaio’s makeshift jails:

Several hundred protesters blockaded a Phoenix jail Thursday and swarmed the downtown headquarters of Maricopa County Sheriff Joe Arpaio, who pledged to launch another “crime sweep” targeting illegal immigrants across the city Thursday afternoon.

About 100 police officers in riot gear met the protesters and several were arrested.

The demonstrations continued despite action by a federal judge Wednesday that blocked the most contested provisions of Arizona’s new immigration law one day before they were to take effect. Arpaio had said he would continue the sweeps regardless of the ruling.

This photo shows some of the blockade.

This is a fast-moving development, so stay tuned.