Several hundred activists marched in protest on Thursday as a toned down new Arizona immigration law went into effect, sparking a tense standoff with riot police in which about two dozen people were arrested.

Arizona Governor Jan Brewer appealed against a judge's injunction stripping the most contentious sections from the legislation, as angry protestors were met by scores of police in riot gear.

Civil rights groups marched through Phoenix, the capital of Arizona, to denounce the new law, even though a judge has temporarily stripped it of key powers allowing police to spot check the immigration status of all suspects.

Judge Susan Bolton ruled Wednesday that those powers would place a burden on legal resident aliens living in Arizona, where one in three of the 6.6 million people is foreign-born and an estimated 460,000 are illegal immigrants.

Protestors urged schools, town and city governments and local police departments not to comply with the law, which they say amounts to ethnic profiling.

Waving Mexican and US flags, the activists marched on the courthouse and the offices of tough county sheriff Joe Arpaio, brandishing banners demanding "Stop the Raids, No More Deportations" and "Stop Targeting Immigrants Now."

About a dozen demonstrators chained themselves to the metal doors of the Maricopa County jail until sheriff's deputies emerged from the building to take them inside, an AFP correspondent saw.

Activists accused the authorities of fostering "a climate of hate."

"They're not hiding their intentions, and we intend to resist," said Alfredo Gutierrez, a former state senator and activist with the Somos America rights group.

He and other demonstrators said what really was needed was swift federal action on immigration reform.
"The problems in Arizona are not for a judge to solve," Loewe said. "There are no partial solutions to the human rights crisis. (President Barack) Obama has the power to solve that crisis with the stroke of a pen."

Officials in Arizona, which borders Mexico, argue the Obama administration has failed to secure the borders, and they are overwhelmed by illegal immigrants.

Brewer, who signed the bill into law in April, vowed to now take the fight to the US Supreme Court.

"Illegal immigration is an ongoing crisis the state of Arizona did not create and the federal government has refused to fix," she said.

Judge Bolton on Wednesday suspended the most contested parts of the law hours before it went into effect at one minute after midnight (0701 GMT Thursday).

She ruled that sections handing police the power to check the immigration status of all suspected criminals and making it a crime not to carry proper papers were suspended.

She also temporarily froze a section making it a crime for illegal immigrants to solicit work -- a clause aimed at the queues of people who gather every morning waiting for employers to drive by and offer them spot jobs.

The row over the Arizona law has thrust the issue of the nation's estimated 11 million illegal immigrants once more into the spotlight, after a series of failed legislative attempts to bring them out of the shadows.

(Source: AFP)