Mexico's Foreign Ministry on Tuesday issued an advisory to Mexicans living and working in Arizona following the signing of a controversial law to stem illegal immigration in that state.
In Arizona "there is a negative political environment for migrant communities and for all Mexican visitors," the advisory states.
The new law requires Arizona police to determine whether people are in the United States legally if there is a reason to suspect they aren't.
Although the new law doesn't go into effect until 90 days after the close of the state's legislative session, the Mexican government advised its citizens in Arizona to begin carrying all immigration documents with them immediately "to avoid needless confrontations."
Arizona Gov. Jan Brewer, a Republican, signed the controversial legislation into law Friday. Supporters say it is needed to control illegal immigration.
The advisory points Mexicans in Arizona to the state's five Mexican consulates for legal advice if they feel they have been subjected to abuse by authorities.
"As long as no clear criteria are defined for when, where and who the authorities will inspect, it must be assumed that every Mexican citizen may be harassed and questioned without further cause at any time," the advisory states.