PHOENIX — Civil rights advocates vowed Saturday to challenge Arizona's tough new law targeting illegal immigration, saying it will lead to racial profiling of Hispanics despite the governor's assurance abuses won't be tolerated. Republican Gov. Jan Brewer on Friday signed into law a bill that supporters said would take handcuffs off police in dealing with illegal immigration in Arizona, the nation's busiest gateway for human and drug smuggling from Mexico and home to an estimated 460,000 illegal immigrants. The law requires police to question people about their immigration status, if they suspect someone is in the country illegally. It's sparked fears among legal immigrants and U.S. citizens that they'll be hassled by police just because they look Hispanic. The new law makes it a crime under state law to be in the country illegally. Immigrants unable to produce documents showing they are allowed to be in the U.S. could be arrested, jailed for up to six months and fined $2,500.