Federal police officers stand outside the grounds of the Sandra Day O'Connor Court House in Phoenix, Arizona. (File photo)
Police in the US state of Arizona have been authorized to enforce the controversial "show-your-papers" provision of the state’s immigration law.
US District Judge Susan Bolton, in a written order on Tuesday, lifted an injunction banning the measure, which authorizes law enforcement officers to question people about their immigration status.
The measure is part of the “SB 1070” signed into law in 2010 by Arizona's Republican Governor Jan Brewer.
"Today is the day we have awaited for more than two years," Brewer said in response to Bolton's ruling.
"It must be enforced efficiently, effectively and in harmony with the Constitution and civil rights. I have full faith and confidence that Arizona's State and local law enforcement officers are prepared for this task," she said in a statement.
The “show-your-papers” measure was upheld by the US Supreme Court in June.
The opponents of the law have described it as racial profiling against Hispanics.
"President Obama has the moral responsibility and legal authority to protect the people of Arizona," the National Day Laborer Organizing Network said in a statement.
"We expect he will do everything within his power to prevent the discrimination, punishment, and suffering that will escalate under ... (the law's) implementation," it added.